x4 or x16 slot critical with cuda?


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Questions and Answers : GPU applications : x4 or x16 slot critical with cuda?

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Chuck Gorish
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Message 920481 - Posted: 22 Jul 2009, 22:56:00 UTC

all things being equal and speaking only about cuda processing and nothing else, with a gtx285 will there be a noticable difference in wu production whether it is in a x16 or a x4 slot?
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Message 920545 - Posted: 23 Jul 2009, 2:54:33 UTC - in response to Message 920481.

No, it is not critical. In fact, tests in Number Crunching have shown the PCIe speed to make very little difference.
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Chuck Gorish
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Message 920608 - Posted: 23 Jul 2009, 8:10:24 UTC - in response to Message 920545.

thank you! makes life much simpler now.

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Message 920895 - Posted: 24 Jul 2009, 1:42:51 UTC
Last modified: 24 Jul 2009, 1:44:40 UTC

I 'modified' a few x1 slots and ran some tests.

I compared two IDENTICAL cards, 1 running in an x16 slot and the second card running in an x1 slot (at the same time) and there was essentially NO difference when comparing WU results and running time.

The cards were Geforce 9600 GSO 768 MB DDR2 cards.

I am reluctant to say if the same will ring true with GTX 200 series cards, but I can't see why not.




The thread I started....
http://setiathome.berkeley.edu/forum_thread.php?id=54467
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Questions and Answers : GPU applications : x4 or x16 slot critical with cuda?

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