What "bits" is system memory?

I have heard all system memory is 64 bit only, is this true? If so, why do graphics cards get 256bit+ memory but our main memory is so anemic?
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  1. Quote:
    I have heard all system memory is 64 bit only, is this true?
    Only if you are referring to PCs and single channel mode. It's 128-bit in dual channel mode and 196-bit in triple channel mode.
  2. All PC memory is 64-bit (72-bit for ECC). The other references to 128-bit or 196-bit are access modes, not bus widths.
  3. protokiller said:
    I have heard all system memory is 64 bit only, is this true? If so, why do graphics cards get 256bit+ memory but our main memory is so anemic?


    As said below, system RAM is currently 64-bit, and the 128/192 bit reads are access modes, and don't affect the storage of data.

    System RAM is 64 bit because you have relativly fast CPU's with fast interconnects to grab the data at a rapid pace, where GPU's tend to pull more data at once, but operate at a slower speed. Basically, the CPU reads less data, but reads more often to make up the difference.
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