Can anyone explain these differences between two similar i7 processors? [closed]
- by Brian Frost
I have two systems I've just built. They both have i7 processors and Asus P8Z77 motherboards. When I run a simple processor loop benchmark that I wrote in Delphi some time back I get one machine showing nealry twice as fast as the other. I then used CPU-Z to dump me the details of the hardware and I see that the fast machine shows:
Processor 1 ID = 0
Number of cores 4 (max 8)
Number of threads 8 (max 16)
Name Intel Core i7 2700K
Codename Sandy Bridge
Specification Intel(R) Core(TM) i7-2700K CPU @ 3.50GHz
Package (platform ID) Socket 1155 LGA (0x1)
CPUID 6.A.7
Extended CPUID 6.2A
Core Stepping D2
Technology 32 nm
TDP Limit 95 Watts
Core Speed 3610.7 MHz
Multiplier x FSB 36.0 x 100.3 MHz
Stock frequency 3500 MHz
the slow machine shows:
Processor 1 ID = 0
Number of cores 4 (max 8)
Number of threads 8 (max 16)
Name Intel Core i7 2600K
Codename Sandy Bridge
Specification Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz
Package (platform ID) Socket 1155 LGA (0x1)
CPUID 6.A.7
Extended CPUID 6.2A
Core Stepping D2
Technology 32 nm
TDP Limit 95 Watts
Core Speed 1648.2 MHz
Multiplier x FSB 16.0 x 103.0 MHz
Stock frequency 3400 MHz
i.e the slow machine has a 2600k to the fast machine 2700k. The very different "Multiplier x FSB" must be significant but I dont understand how two processors with a very 'similar' number can be so different. To get the machines the same must I copy the processors or is there some clever setting that I can change?
Thanks for any help.
Brian.
