Message boards :
Number crunching :
PCI-e lanes & GPU bottlenecks
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Author | Message |
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Send message Joined: 21 Sep 11 Posts: 41 Credit: 185,458,736 RAC: 0 |
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 |
Send message Joined: 26 Feb 11 Posts: 170 Credit: 205,557,553 RAC: 0 |
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 |
Send message Joined: 15 Jul 08 Posts: 383 Credit: 729,293,740 RAC: 0 |
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. |
Send message Joined: 14 Feb 09 Posts: 999 Credit: 74,932,619 RAC: 0 |
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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