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r600 uses only 256 mb video ram!

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  • r600 uses only 256 mb video ram!

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    Last edited by bongmaster2; 05-13-2015, 05:08 PM.

  • #2
    The BAR limit (aperture visible to the CPU) is 256 MB but the latest memory manager code can let the CPU access more than 256 MB by dynamically mapping it into the aperture. The GPU can always address the entire video memory anyways. I believe the 256MB limit is a PCI spec.

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    • #3
      The memory manager is in the kernel driver, so it's the same for 600g and 600c. If you hear talk about GEM/TTM that's the memory manager (and some other stuff).

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      • #4
        dmesg | grep VRAM

        If your kernel is new enough. (2.6.35?)

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        • #5
          I didn't actually expect to see that mesage (unless you had a 256 MB graphics card, of course ). How much VRAM does your card have ?

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          • #6
            And it's sure that it's supposed to be 512M VRAM instead of eg 256M VRAM + 256M system RAM?

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