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• How to get the best LINPACK result and conquer the Top500?

  - by knweiss

  Given a large Linux HPC cluster with hundreds/thousands of nodes. What are your best practices to get the best possible LINPACK benchmark (HPL) result to submit for the Top500 supercomputer list? To give you an idea what kind of answers I would appreciate here are some sub-questions (with links): How to you tune the parameters (N, NB, P, Q, memory-alignment, etc) for the HPL.dat file (without spending too much time trying each possible permutation - esp with large problem sizes N)? Are there any Top500 submission rules to be aware of? What is allowed, what isn't? Which MPI product, which version? Does it make a difference? Any special host order in your MPI machine file? Do you use CPU pinning? How to you configure your interconnect? Which interconnect? Which BLAS package do you use for which CPU model? (Intel MKL, AMD ACML, GotoBLAS2, etc.) How do you prepare for the big run (on all nodes)? Start with small runs on a subset of nodes and then scale up? Is it really necessary to run LINPACK with a big run on all of the nodes (or is extrapolation allowed)? How do you optimize for the latest Intel/AMD CPUs? Hyperthreading? NUMA? Is it worth it to recompile the software stack or do you use precompiled binaries? Which settings? Which compiler optimizations, which compiler? (What about profile-based compilation?) How to get the best result given only a limited amount of time to do the benchmark run? (You can block a huge cluster forever) How do you prepare the individual nodes (stopping system daemons, freeing memory, etc)? How do you deal with hardware faults (ruining a huge run)? Are there any must-read documents or websites about this topic? E.g. I would love to hear about some background stories of some of the current Top500 systems and how they did their LINPACK benchmark. I deliberately don't want to mention concrete hardware details or discuss hardware recommendations because I don't want to limit the answers. However, feel free to mention hints e.g. for specific CPU models.

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• Strange sound from Laptop, Microphone, Speakers or Soundcard?

  - by David Schilling

  I have recently purchased a second hand computer. There didn't seem to be anything wrong with it on purchasing, however recently I have noticed a small issue. Any time I play sound or listen through my headphones, I can hear what seems to be the CPU working (ie when beginning a new task, there is a small crackling). Also if I tap my laptop I can hear the sound louder, as if it is being picked up by the mic and then playing that sound in real time through the speakers or headphones. I have tried reading other topics but cannot find an answer to this question. These are the specs I am running on; Windows 7 Home Premium 32bit Pentium Dual Core CPU T4300 @ 2.10Ghz 2.10Ghz I hope someone can help me with this issue, it would be much appreciated.

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• PC reboots spontaenously: debugging tips

  - by aaron

  I swapped my core 2 duo for a quad core recently, and generally things run fine, but every now and then my computer just restarts. I don't even get a blue screen (Vista 32). Core temp isn't a problem. My thinking is that my power supply is inadequate, but I haven't been able to test that (one idea was to under clock the cpu to see if that helped, but going up in speed was the only simple thing to do in the BIOS) Two cases where I semi-consistanly get problems: - Borderlands windowed after some period of time (and some other games, but Borderlands does it pretty regularly) - watching a video (e.g. quicktime/vlc) and having another video running Another thought is non-cpu heat? Maybe the graphics card? Any thoughts on how to track this down appreciated. Thanks!

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• Varnish server in front of nginx server with multiple virtualhosts

  - by Garreth 00

  I have tried to search for a solution for this, but can't find any documentation/tips on my specific setup. My setup: Backendserver: ngnix: 2 different websites (2 top domains) in virtualenv, running gunicorn/python/django Backendserver hardware(VPS) 2gb ram, 8 CPU Databaseserver: postgresql - pg_bouncer Backendserver hardware (VPS) 1gb ram, 8 CPU Varnishserver: only running varnish Varnishserver hardware (VPS) 1gb ram, 8 CPU I'm trying to set up a varnish server to handle rare spike in traffic (20 000 unique req/s) The spike happens when a tv program mention one of the sites. What do I need to do, to make the varnish server cache both sites/domains on my backendserver? My /etc/varnish/default.vcl : backend django_backend { .host = "local.backendserver.com"; .port = "8080"; } My /usr/local/nginx/site-avaible/domain1.com upstream gunicorn_domain1 { server unix:/home/<USER>/.virtualenvs/<DOMAIN1>/<APP1>/run/gunicorn.sock fail_timeout=0; } server { listen 80; listen 8080; server_name domain1.com; rewrite ^ http://www.domains.com$request_uri? permanent; } server { listen 80 default_server; listen 8080; client_max_body_size 4G; server_name www.domain1.com; keepalive_timeout 5; # path for static files root /home/<USER>/<APP>-media/; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (!-f $request_filename) { proxy_pass http://gunicorn_domain1; break; } } } My /usr/local/nginx/site-avaible/domain2.com upstream gunicorn_domain2 { server unix:/home/<USER>/.virtualenvs/<DOMAIN2>/<APP2>/run/gunicorn.sock fail_timeout=0; } server { listen 80; listen 8080; server_name domain2.com; rewrite ^ http://www.domains.com$request_uri? permanent; } server { listen 80; listen 8080; client_max_body_size 4G; server_name www.domain2.com; keepalive_timeout 5; # path for static files root /home/<USER>/<APP>-media/; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; if (!-f $request_filename) { proxy_pass http://gunicorn_domain2; break; } } } Right now, If I try the Ip of the varnishserver I only get served domain1.com. Would everything be correct if I change the DNS of the two domain to point to the varnishserver, or is there extra setup before it would work? Question 2: Do I need a dedicated server for varnish, or could I just install varnish on my backendserver, or would the server run out of memory quick?

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• How to find spyware dll launched using svchost.exe

  - by Sheen

  This weekend I found my PC was possibly infected by some virus or spyware. There is one "svchost.exe -k netsvcs" in my task manager, and it is running under my user name, rather than SYSTEM accounts. There is already another same process with same command line options under SYSTEM account. This user account svchost.exe consistently consumes 50% CPU (1 of 2 cores of my CPU). In Process Explorer, I can see it is started by explorer.exe, instead of services.exe. However, I failed to find its real service dll place in registry or disk. Does anyone know how to find this malicious program?

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• Does ZFS cache Compressed or Uncompressed data in a ZFS file-system with compression turned on?

  - by George Bailey

  ZFS supports file-system compression and it also caches frequently or recently accessed data. If a system has lots of CPU but the underlying data storage system is slow. It is possible that ZFS would perform better with compression turned on. This can be easily tested when writing files by measuring CPU and disk usage and throughput. (of course latency may exist,, but this would not be an issue for large files). But what about cache? If data will have to be decompressed every time it is read then this is probably less of a good idea. Is the cached data compressed?. Does anybody have some information on this?

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• Terminal Server 2003 Performance Troubleshooting

  - by MikeM

  Let me get your thoughts on terminal server performance problems. The server hosts average 25 users which, after running some numbers, on average use 600MB memory with their main applications running (web browser, adobe reader, IP phone client). All users are on the same LAN as server. We constantly experience slow response and short session lockups. Combined CPU usage is on average 10%. What appears strange to me is that the system shows 29GB physical memory with 25GB of it free. The page file usage is about 50% averaging 9GB used. Some server specs OS: Server 2003 32bit Enterprise with /PAE flag RAM: 32GB CPU: 2xQuad Core @ 2.27Ghz HD: RAID5 1.2GB After doing basic troubleshooting using performance monitor it leads me to believe that the performance problems are caused by the 32bit OS limitation in addressing full 32GB of physical memory even though the /PAE flag is used. Can anyone suggest something, troubleshooting steps that can lead to a more conclusive answer? Thanks

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• NVIDIA Driver Crashing on Custom-Built Windows 7 PC

  - by srunni

  I've got a custom-built PC with these specs: Fractal Design Define R3 ASUS P8Z77-V motherboard Intel Core i7-2700k with Thermalright HR-02 Macho Cooler NVIDIA GeForce GTX 560 with Arctic Cooling Accelero Twin Turbo II Cooler Crucial M4 128 GB SSD 1 TB Hitachi HDD G.SKILL Ares Series 2x8 GB RAM (x2) SeaSonic 520W PSU Windows 7 Ultimate SP1 (x64) NVIDIA driver version 301.42 Upon building the PC, I overclocked the CPU (but never the GPU), and there were no problems for 1-2 months. Then I started getting crashes with this error when doing anything that's computationally or graphically intensive: I un-overclocked the CPU, but that hasn't fixed anything. This is what the inside of my case looks like: I'd appreciate any guidance on resolving this problem. I did get some of the thermal paste on the graphics card when installing the aftermarket cooler, but there were no issues for a month or two. Update I did a clean install and the issue persisted - looks like it's a hardware issue. I will try removing/cleaning/reseating all the parts.

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• Common filesystem for servers behind a rackspace load balancer

  - by thanos panousis

  Our PHP application consists of a single web server that will receive files from clients and perform a CPU-intensive analysis on them. Right now, analysis of a single user upload can take 3sec to conclude and take 100% CPU. This makes our system capacity amount to 1/3 requests per second. My team's requirement is to increase capacity without a lot of code reengineering. A possible solution would be to set up a load balancer in front of multiple servers running the same app, connecting to a common DB. The problem is that the analysis outputs files on disk. A load balancer would increase capacity, but then files won't be available between servers so consequent client requests may fail. We are hosted on Rackspace, is there a way to configure some sort of "common" storage for all servers, without having to rewrite our file persistance code? Current code relies on simple fopens etc. What are our options?

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• Few questions on giga tweaker

  - by user23950

  I better consult first the people here before I do anything unnecessary using this app called giga tweaker. I don't really understand what this increase the performance of your CPU thing. It is under Customization-Memory Management-ram & disk cache of giga tweaker. What will happen if I change the level cache size of l2 cache into the highest possible value which is 8Mb. What are the negative effects of doing it? The file system caching memory, still under Customization-Memory Management-ram & disk cache. What effects will it have on my system which has 2Gb of Ram and 2.50 Ghz of Dual Core CPU. Please enlighten me.

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• Nagios remote monitoring: NRPE Vs. SSH

  - by sam

  We use Nagios to monitor quite a few (~130) servers. We monitor CPU, Disk, RAM and a few other things on each server. I've always used SSH to run the remote commands, purely because it requires little to no additional config on the remote server, just install nagios-plugins, create the nagios user and add the SSH key, all of which I've automated into a shell script. I've never actually considered the performance implications of using SSH over NRPE. I'm not too bothered about the load hit on the Nagios server (It's probably over-speced for what it does, it's never been over 10% CPU), but we run each remote check every 30 seconds and each server has 5 different checks performed. I assume SSH requires more resources for each check but is there a huge difference? (I.E. enough of a difference to warrant the switch to NRPE). If it's any help, we monitor a mix of physical servers (Normally with 8, 12 or 16 physical cores) and Amazon EC2 medium/large instances.

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• Fan is spinning too fast just in Windows - software?

  - by B. Roland

  I've recently replaced my fans (CPU, GPU, and bought a CHA fan). The GPU remained the same, but I've seen it when it was spinned 2 times faster, than it usual... but it is rarely. The problem is, that the CPU fan in Windows (especially 7) spinned too much, 'cos it keeps in under 40°C, and it is spinning with 3300-3600 RPM, which is too high I think. If I swich to Ubuntu, it keeps on ~40-45°C with with 2500-2800 RPM, which is a big difference in numbers, and in noise. I'm looking for a manual fan control solution, or just reduce the Windows' multipliers of fan speed control, somehow... I was bought the new fans because of the lower noise (and it does it, but not with 3.6k RMP). Thank you!

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• How OS comunicates with HW?

  - by Jack

  Hi, how can program runnig on CPU (mostly OS) acess other PC hardware? Such as Graphic card, HDD and so? From what I read, In DOS, this was done using BIOS calls, specifically INT instruction. But, int instruction should only jump to the certain space in RAM. So, how can some program stored in RAM acess other computer HW, when CPU can acess only RAM, and reeive interrupts? And, does windows use int instructions as well, or is there any new way to communicate with HW? Thanks.

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• null pointer exception comparing two strings in java.

  - by David

  I got this error message and I'm not quite sure whats wrong: Exception in thread "main" java.lang.NullPointerException at Risk.runTeams(Risk.java:384) at Risk.blobRunner(Risk.java:220) at Risk.genRunner(Risk.java:207) at Risk.main(Risk.java:176) Here is the relevant bits of code (i will draw attention to the line numbers within the error message via comments in the code as well as inputs i put into the program while its running where relevant) public class Risk { ... public static void main (String[]arg) { String CPUcolor = CPUcolor () ; genRunner (CPUcolor) ; //line 176 ... } ... public static void genRunner (String CPUcolor) // when this method runs i select 0 and run blob since its my only option. Theres nothing wrong with this method so long as i know, this is only significant because it takes me to blob runner and because another one of our relelvent line numbers apears. { String[] strats = new String[1] ; strats[0] = "0 - Blob" ; int s = chooseStrat (strats) ; if (s == 0) blobRunner (CPUcolor) ; // this is line 207 } ... public static void blobRunner (String CPUcolor) { System.out.println ("blob Runner") ; int turn = 0 ; boolean gameOver = false ; Dice other = new Dice ("other") ; Dice a1 = new Dice ("a1") ; Dice a2 = new Dice ("a2") ; Dice a3 = new Dice ("a3") ; Dice d1 = new Dice ("d1") ; Dice d2 = new Dice ("d2") ; space (5) ; Territory[] board = makeBoard() ; IdiceRoll (other) ; String[] colors = runTeams(CPUcolor) ; //this is line 220 Card[] deck = Card.createDeck () ; System.out.println (StratUtil.canTurnIn (deck)) ; while (gameOver == false) { idler (deck) ; board = assignTerri (board, colors) ; checkBoard (board, colors) ; } } ... public static String[] runTeams (String CPUcolor) { boolean z = false ; String[] a = new String[6] ; while (z == false) { a = assignTeams () ; printOrder (a) ; boolean CPU = false ; for (int i = 0; i<a.length; i++) { if (a[i].equals(CPUcolor)) CPU = true ; //this is line 384 } if (CPU==false) { System.out.println ("ERROR YOU NEED TO INCLUDE THE COLOR OF THE CPU IN THE TURN ORDER") ; runTeams (CPUcolor) ; } System.out.println ("is this turn order correct? (Y/N)") ; String s = getIns () ; while (!((s.equals ("y")) || (s.equals ("Y")) || (s.equals ("n")) || (s.equals ("N")))) { System.out.println ("try again") ; s = getIns () ; } if (s.equals ("y") || s.equals ("Y") ) z = true ; } return a ; } ... } // This } closes the class The reason i don't think i should be getting a Null:pointerException is because in this line: a[i].equals(CPUcolor) a at index i holds a string and CPUcolor is a string. Both at this point definatly have a value neither is null. Can anyone please tell me whats going wrong?

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• server performance metrics report and practicality

  - by Anjesh

  I have a need of preparing web server (apache-php) performance report containing important metrics like CPU usage, disk io, memory usage on user basis. Couple of domains are hosted in the same server and they run from separate users using fcgi. The reason being sometimes some hosted applications take lots of cpu usage, making the server slow for other applications (running as separate users). i am planning to develop scripts for this, as i can't seem to find any simple utilities for this purpose. This script will take snapshots of the user wise metrics at defined periods say 15 minutes and record it. Any abnormalities will be reported via emails. How practical is that? also would be interesting to know what else need to be recorded.

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• building a new pc - no display, no beeps

  - by Adam

  Hi Building a new pc using this motherboard: GA-MA785GMT-UD2H and a 500W power supply (1 x 20 pin & 1 x 4 pin connectors). The CPU fan, hard drive and power supply all spin up but no display on the monitor and no beeps. Have tried: taking out all of the memory and still no beeps used a different power supply and still no display I only have the Motherboard, memory, CPU, heat sink & fan & power supply connected. Any ideas? Do I have a faulty motherboard?

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• List and kill running processes on Mac OS in Ctrl/Alt/Delete-like way?

  - by AP257

  So, what do you do on a Mac when a process (as opposed to an application) is hogging CPU, swamping your machine, and you need to kill it? I know you can use top or open Applications > Utilities > Activity Monitor and kill it from there. But what happens when the process is already using so much CPU that doing either of those tasks is impossible? On Windows, you can just do Ctrl/Alt/Delete and the process list will reliably open. So no matter how much your computer is thrashing, you always have access to the list of processes. On Mac OS, there's Cmd/Alt/Escape, which reliably shows running applications. Fine when it's an application causing the problem. But: what do you do if it's a process?

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• free -m output, should I be concerend about this servers low memory?

  - by Michael

  This is the output of free -m on a production database (MySQL with machine. 83MB looks pretty bad, but I assume the buffer/cache will be used instead of Swap? [admin@db1 www]$ free -m total used free shared buffers cached Mem: 16053 15970 83 0 122 5343 -/+ buffers/cache: 10504 5549 Swap: 2047 0 2047 top ouptut sorted by memory: top - 10:51:35 up 140 days, 7:58, 1 user, load average: 2.01, 1.47, 1.23 Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie Cpu(s): 6.5%us, 1.2%sy, 0.0%ni, 60.2%id, 31.5%wa, 0.2%hi, 0.5%si, 0.0%st Mem: 16439060k total, 16353940k used, 85120k free, 122056k buffers Swap: 2096472k total, 104k used, 2096368k free, 5461160k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 20757 mysql 15 0 10.2g 9.7g 5440 S 29.0 61.6 28588:24 mysqld 16610 root 15 0 184m 18m 4340 S 0.0 0.1 0:32.89 sysshepd 9394 root 15 0 154m 8336 4244 S 0.0 0.1 0:12.20 snmpd 17481 ntp 15 0 23416 5044 3916 S 0.0 0.0 0:02.32 ntpd 2000 root 5 -10 12652 4464 3184 S 0.0 0.0 0:00.00 iscsid 8768 root 15 0 90164 3376 2644 S 0.0 0.0 0:00.01 sshd

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• Motherboard Issue - 3 Beep Bios (memory error) despite new RAM

  - by Glenn

  I have an Intel dG43RK motherboard, bought new and sealed, and have tried two different brands and speeds of RAM with a 3-beep BIOS indicating a memory error, which also occurs without RAM installed (as it should). The memory tried is; 1x4GB 1333 Kingston HyperX DDR3 RAM (New and Sealed) 2x4GB Team Elite 1066 DDR3 RAM (New and Sealed) I have tried multiple configurations and seating layouts and still no luck. I also have a GT520 graphics card on board as I dislike in-built graphics in most cases and had it at hand (also new and sealed). The only used parts are the CPU, which worked in my previous tower and was directly taken from the PC into the new set-up and the CPU Fan which will be replaced with a new fan in the foreseeable future once this is resolved. I've run out of ideas myself and any help is appreciated.

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• IIS slow response

  - by Martin Ševic

  I have developed ASP.NET 4.5 application which take infos about sensors from sqlite database every 3 seconds. This application runs nice on my local develop machine on IIS Express server. I have created virtual machine (4x 3,25 GHz CPU; 6GB RAM) where i have installed Windows Server 2012 and IIS 8 service in order to test application on real server because we will run it on production machine later. After installing VC++ 2010 x64 and VC++ 2010 x86 and set "Enable 32-bit application" to true in application pool website started to work but there is a large problem with response time. There is a for example 10 seconds delay before page loads. CPU utillization is about 10% and RAM about 1,5GB. I am new to configuring IIS server so i want to ask if there is some tip how to make it faster. I am sure, there will be some twist which will make it normal work. Many thanks.

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• Virtualbox crashes quite often in Windows 8

  - by user1776158

  I just installed Windows 8 on my computer. I got the ISO and the product key from my university so the software itself is sound. I use alot of virtual box. And ever since I moved to Windows 8, I have noticed that virtual box crashes more often. In particular, it is very very bad at opening multiple guests. My CPU usage will be at like 20% and I only have 3 guests open and my entire computer just freezes. Cursor and all. In Windows 7, I was able to open like 6 (not that I ever needed to) and really push my CPU. I havent experience any other issues with Windows 8 yet. Has anyone encountered this? Thanks!

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• kvm process has too large a memory footprint on host

  - by gucki

  I'm using latest ubuntu quantal and start a kvm guest which should have 2048 MB of memory. Now after a few hours I can see that the kvm process of this guest is around 2700 MB, so 700 MB more than the guest should be able to consume. I mean a small overhead like 1% would be ok, but not 30%?! root 8631 74.0 22.2 4767484 2752336 ? Sl Nov07 512:58 kvm -cpu kvm64 -smp sockets=1,cores=2 -cpu kvm64 -m 2048 -device virtio-blk-pci,drive=drive-virtio0,id=virtio0,bus=pci.0,addr=0xa,bootindex=100 -drive file=rbd:data/vm-disk-1,if=none,id=drive-virtio0,cache=writeback,aio=native -device virtio-net-pci,netdev=net0,bus=pci.0,addr=0x12,id=net0,mac=02:7a:86:e6:1a:6c,bootindex=200 -netdev type=tap,id=net0,vhost=on -usbdevice tablet -nodefaults -enable-kvm -daemonize -boot menu=on -vga cirrus root 8694 0.0 0.0 0 0 ? S Nov07 0:00 [kvm-pit/8631] How is this possible and how to prevent it?

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• High Load average threshold in linux

  - by user2481010

  My one of friend said that his server load average sometime goes above 500-1000, for me it is strange value because I never saw load average more than 10. I asked him give me some snapshot of top and memory usages, he gave following details: TOP USAGES top - 06:06:03 up 117 days, 23:02, 2 users, load average: 147.37, 44.57, 15.95 Tasks: 116 total, 2 running, 113 sleeping, 0 stopped, 1 zombie Cpu(s): 16.6%us, 6.9%sy, 0.0%ni, 9.2%id, 66.5%wa, 0.0%hi, 0.8%si, 0.0%st Mem: 8161648k total, 7779528k used, 382120k free, 3296k buffers Swap: 5242872k total, 1293072k used, 3949800k free, 168660k cached Free $ free -gt total used free shared buffers cached Mem: 7 6 1 0 0 4 -/+ buffers/cache: 1 5 Swap: 4 0 4 Total: 12 6 6 Total cpu $ nproc 8 my question is it possible load average more than 100 on 8 core,12 GB mem Server? because I read many tutorial,article on load average, it said that thumb rule is "number of cores = max load" according to thumb rule here is max load average 16 then how his server running with 147.37 load server? he said that it is least value (147.37) some time goes more than 500.

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• How do I change the output line length from the "top" linux command running in batch mode

  - by Tom

  The following command is useful to capture the current processes that are taking up the most CPU in a file: top -c -b -n 1 > top.log The -c flag is particularly useful because it gives you the command line arguments of each process rather than just the process name. The problem is that each line of output is truncated to fit on the current terminal window. This is ok if you can have a wide terminal because you have a lot of the output but if your terminal is only 165 characters wide, you only get 165 characters of information per process and it is often not enough characters to show the full process command. This is a particular problem when the command is executed without a terminal, for example if you do it via a cron job. Does anyone know how to stop top truncating data or force top to display a certain number of characters per line? This is not urgent because there is an alternative method of getting the top 10 CPU using processes: ps -eo pcpu,pmem,user,args | sort -r -k1 | head -n 10

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• Choosing parts for a high-spec custom PC - feedback required [closed]

  - by James

  I'm looking to build a high-spec PC costing under ~£800 (bearing in mind I can get the CPU half price). This is my first time doing this so I have plenty of questions! I have been doing lots of research and this is what I have come up with: http://pcpartpicker.com/uk/p/j4lE Usage: I will be using it for Adobe CS6, rendering in 3DS Max, particle simulations in Realflow and for playing games like GTA IV (and V when it comes out), Crysis 1/2, Saints Row The Third, Deus Ex HR, etc. Questions: Can you see any obvious problem areas with the current setup? Will it be sufficient for the above usage? I won't be doing any overclocking initially. Is it worth buying the H60 liquid cooler, or will the fan that comes with the CPU be sufficient? Is water cooling generally quieter? Is the chosen motherboard good for the current components? And is it future-proof? I read that the HDD is often the bottleneck when it comes to gaming. I presume this is true to other high-end applications? If so, is my selection good? I keep changing my mind about the GPU; first the 560, now the 660. Can anyone shed some light on how to choose? I read mixed opinions about matching the GPU to the CPU. Will the 560 or the 660 be sufficient for my required usage? Atm I'm basing my choice on the PassMark benchmarks and how much they cost. The specs on the GeForce website state that the 560 and the 660 both require 450W. Is this a good figure to base the wattage of my PSU on? If so, how do you decide? Do I really need 750W? The latest GTX 690 requires 650W. Is it a good idea to buy a 750W PSU now to future-proof myself?

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