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OpenGL Best video card for OpenGL performance

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silvermace    634
hey all, our strict hardware setup is limited to a 4x PCIe lane (2GB/s up+down gross), we want use the graphics card to do some GPGPU stuff to help crunch some numbers. What I want to know is which video card to use to best match PBO transfer performance for this bus setup, obviously putting a 9800GX2 into a 4x slot is the biggest waste of $$ ever. these are rough numbers for peak memory bus b/w and # of stream processors from google: 8500GT - 13 GB/s / 16 8600GT - 22 GB/s / 32 8800GT - 58 GB/s / 112 9800GX2 - 128 GB/s (insane.) / 256 the main thing here is to find the lowest cost card which will maximise the bus utilization. We don't want our GL shaders executing on 256 stream processors but having to wait around 70% of the time for the bus transfers to complete.. Our main transfer method is going to be PBO's and various textures, we want to maximise the parallel data transfer (in/out) on this card, would PBO's be the right choice to allow for this? Basically, im just trying to find the best card for the OpenGL task at hand..

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Krohm    5030
Unluckly, I fear that if you're going to use them for generic processing you're going to have a few issues with a x4 lane.
With a so strong limitation, I personally would go for a cheap cart as an initial proof of concept and possibly move later on more interesting upgrades.

I say this for a reason - I made some research years ago on a new sort of FEM-like method - the project later didn't made to an official contract and thus I left it in the dust.

I am not well aware how much memory goes with the 8500GT but I suggest to take 512MB. I suppose exhausting 256MB could be pretty easy nowadays and this was basically a big hit for me.

Why do you have that x4 limitation anyway?

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silvermace    634
Hi Krohm, thanks for the reply. Yeah that's what I feared. I can get my hands on an 8600GT for $130 NZD (~63 euro) so I think I will go for that, an 8500 seems almost pointless with only 16 stream processors...

The limitation is on the motherboard we are using, unfortunately but its all we have to work with (the are workstation boards so we cant simply replace them with mainstream ones)

[Edited by - silvermace on May 15, 2008 3:11:16 AM]

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