64 bit Ubuntu sees half my RAM

Posted by koehn on Ask Ubuntu See other posts from Ask Ubuntu or by koehn
Published on 2012-09-14T18:13:04Z Indexed on 2012/09/15 15:48 UTC
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kernel

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ram

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mythbuntu

This is on my AMD FX(tm)-4100 Quad-Core Processor (according to /proc/cpuinfo) on a machine with two 4GB RAM DIMMs. BIOS shows 8GB RAM installed. Any help would be appreciated.

RAM: Extreme Performance Sector 5 G Series 8GB DDR3-1333 (PC3-1066) Enhanced Latency Dual Channel Desktop Memory Kit (Two 4GB Memory Modules)

MB: GA-78LMT-S2P Socket AM3+ 760G mATX AMD Motherboard

CPU: FX 4100 Black Edition 3.6GHz Quad-Core Socket AM3+ Boxed Processor

Here's what the software says:

$ free
             total       used       free     shared    buffers     cached
Mem:       3515100    3293656     221444          0      19260    2670352
-/+ buffers/cache:     604044    2911056
Swap:      3650556      90916    3559640

$ uname -a
Linux mythbuntu 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

From lshw:

 *-memory
      description: System Memory
      physical id: 20
      slot: System board or motherboard
      size: 4GiB
    *-bank:0
         description: DIMM 1066 MHz (0.9 ns)
         product: None
         vendor: None
         physical id: 0
         serial: None
         slot: A0
         size: 2GiB
         width: 64 bits
         clock: 1066MHz (0.9ns)
    *-bank:1
         description: DIMM 1066 MHz (0.9 ns)
         product: None
         vendor: None
         physical id: 1
         serial: None
         slot: A1
         size: 2GiB
         width: 64 bits
         clock: 1066MHz (0.9ns)

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