Re: AMD CPUs in ASRock motherboards

On Mon, 24 Oct 2005 20:47:47 GMT, Robert Redelmeier
<redelm@xxxxxxxxxxxxxxx> wrote:

>Felger Carbon <fmsfnf@xxxxxxxxxx> wrote:
>> "Robert Redelmeier" <redelm@xxxxxxxxxxxxxxx> wrote in message
>>> My deepest condolences. You have shared memory.
>>> 1200x1024x32bpp at 72 Hz refresh eats 354 MB/s of
>>> your RAM bandwidth. Plus latency ever x? transfers.
>>
>> By golly you're right, Robert! That what, 3% overhead will
>
>I believe DDR has a max burst bandwidth of 3200 MB/s, so
>it's at least 11%. But the bursts have very limited length,
>a cacheline or 4 before there's a whole new latency cycle. (I
>think VRAM can burst longer). As a result AFAIK average
>bandwdith is around 1 GB/s. Your shared mem eats 35%.

Felger actually high-balled the amount of overall performance it costs
you though, usually you're looking at less than a 1% loss in
performance for most office tasks. Honest.

There's a good reason why something like 60% of all PCs use integrated
graphics these days, it just doesn't make a difference for what the
vast majority of us do.

-------------
Tony Hill
hilla <underscore> 20 <at> yahoo <dot> ca
.

Relevant Pages

  • Re: AMD CPUs in ASRock motherboards
    ... You have shared memory. ... >>> your RAM bandwidth. ... Plus latency ever x? ... >think VRAM can burst longer). ...
    (comp.sys.ibm.pc.hardware.chips)
  • Re: AMD CPUs in ASRock motherboards
    ... You have shared memory. ... >> your RAM bandwidth. ... Plus latency ever x? ... Robert! ...
    (comp.sys.ibm.pc.hardware.chips)
  • Re: AMD CPUs in ASRock motherboards
    ... You have shared memory. ... >>> your RAM bandwidth. ... > a cacheline or 4 before there's a whole new latency cycle. ... > think VRAM can burst longer). ...
    (comp.sys.ibm.pc.hardware.chips)