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8G/s? Nowhere near enough. Enough for text, but try doing real
computation using that GPU...
PS3 is running 25G/s bi-directional. Those bits move.
Paul
On 30-Apr-06, at 5:52 PM, erik quanstrom wrote:
i only have a pci card, but someone with an agp card and a machine
that
allows bios-controlled agp bandwidth could eliminate some
possibilities.
if it's bus limited, then the total performance should be linear in
agp
bus speed, right? of course we still wouldn't know which direction on
the bus was limiting.
perhaps it's time to add another machine to the second-hand
hardware collection.
;-)
pci-x (1.066G/s) has the same bandwidth as PCIe x4 (1G/s).
PCIe SLI = 2 * 16x = 8G/s, which ought to be enough for just about
anyone.
- erik
On Sun Apr 30 13:13:21 CDT 2006, [EMAIL PROTECTED] wrote:
Frame buffer memory is very very slow to read from,
and not just on nvidia. When I did some timings six years
ago, I found that reading from frame buffer memory
was slower than reading from disk. I'm sure the situation
hasn't gotten better. It's not on the fast path for any
other system, so the vendors just don't care.
I may be talking rubbish but I understood this is a fundamental
problem with reading VGA memory over the PCI bus. VGA cards are
designed for fast writes and not fast reads.
People have been very interested in using the GCPUs in graphics cards
to do video processing (to disk rather than for display) but the
limiting
factor seems to have been the speed at which data can be read back.
I do hear that some cards are appearing with dual PCIX which will
allow
symetric access speeds to the frame buffer.
-Steve
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