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Message boards : Number crunching : PCI-e lanes & GPU bottlenecks
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Andrew McFarland
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Message 51189 - Posted: 23 Sep 2011, 6:37:19 UTC

Hello,
I'm planning a cruncher with a PhenomII 6 core and Radeon 6950's. In an effort to maximize density, am considering (possibly) running some at 8x (instead of 16x)

I wouldn't generally want to hamstring a card like this with 8x if I were using it for display purposes, but I'm not sure it would be as critical for crunching, and even if it was, I might accept a modest inefficiency.

Any thoughts / details about what kind of PCI-e bandwidth M@H would use in this instance. Would 8x be a significant bottleneck?

Thanks. -Andrew
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Message 51190 - Posted: 23 Sep 2011, 7:48:26 UTC

Short answer, no, 16x or 8x does not affect the speed of GPU Computing it does not need that much comunication like games :)
DSKAG Austria Research Team: http://www.research.dskag.at



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Profile Beyond
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Message 51193 - Posted: 23 Sep 2011, 13:44:39 UTC

4x is OK too. I found 790FX boards to be far more capable than 790X or 790GX, far more lanes. Also more versatility as far as mixing ATI/AMD and NVidia GPUs. I would assume that this is also true for the 890FX.
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Message 51196 - Posted: 23 Sep 2011, 15:42:36 UTC

I run my GTX560 on the 4X lane and it crunches just fine there.

I have a HD5830 in the 16X lane for Milkyway.

Motherboard is a Asrock M3A770DE
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Message boards : Number crunching : PCI-e lanes & GPU bottlenecks

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