On 05/17/2011 11:36 AM, Michael Rohn wrote:
Is there a known issue? I searched the board but I had no success.
The problem is also present on a nVidia GTX480.
Look at the links on the Wikipedia page (especially the link to the
OpenGL forum discussion). I haven't seen any official statement on the
issue from nVidia, but the conjecture on the forums seems to be that
it's a deliberate throttling of performance to create a product line
separation between the GeForce "gamer" cards and the Quadro
"professional" cards (Quadro cards are priced many times higher than the
comparable GeForce product). Traditionally, games haven't needed quick
pixel readback as much as other applications (GPU-heaving computational
or scientific applications), so nVidia seems to be making it a
"professional" feature and charging a premium for it.
As the article mentions, you can get around it using CUDA code (and
possibly OpenCL code as well), although that's obviously not a real
solution. There seems to have been a bit of an uproar about this, so it
remains to be seen if nVidia will address this issue or not. I suspect
if enough people jump ship and start buying AMD cards, they might give
it more attention.
--"J"
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