Will 4x pci slot effect cuda crunching

I have asus p6t motherboard and the video slots are the 1st slot is 16x and the 2nd slot is 4x.I have 2 460 cards slot 1 runs at 16x and slot 2 runs at 4x and I can not change this in the bios. So my question is what lga 1366 boards have 2 16x slots and will the second slot running at 4x affect any cuda wu's slower than the 16x slot doing cuda wu's?
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When it comes to crunching, there is little difference between an x4 and an x16 slot for a card. Simply make sure that the x4 slot is x16 size in length, since an x16 card will not physically fit in an x4 slot.




I don't mean to split hairs, but to enlighten and education, I feel it is worth pointing out the difference in using the 'x' before or after the numerical designation.

For instance, when talking about AGP, the 'x' after the number meant it was that much faster than the first bus speed; 8x meant it was 8 times faster than the first speed (32bit x 66MHz). Or when talking about CD/DVD/HD/Blu-Ray discs, the 'x' after the number means it is that many times faster than the original speed, for CD-ROMs 1x was 150KiB/sec, so 2x would be 300KiB/sec and 4x would be 600KiB/sec. For DVD-ROMs 1x is roughly 1.32MiB/sec, 2x is 2.64MiB/sec, etc.


When talking about PCI Express, the 'x' goes before the number to signify how many PCIe "lanes" there are, as each lane has a fixed speed and bitrate. Therefore it should be written as x1, x2, x4, x8, x16 and so on.

The only problems I am having is that the the newer drivers crashes my system unless I run the supplied driver 258.96 when I run the newer drivers 26x.xx drivers I have blue screens and dump and or a black screens. The second card when doing cuda wu runs around 93F though is hot asus web site says 105F it can run.
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The only problems I am having is that the the newer drivers crashes my system unless I run the supplied driver 258.96 when I run the newer drivers 26x.xx drivers I have blue screens and dump and or a black screens. The second card when doing cuda wu runs around 93F though is hot asus web site says 105F it can run.

Don't know what video card you're using, but generally speaking, 93C is pretty darn toasty to run a video card at continuously. I wouldn't do it unless I was just waiting for a card to die so I could get something new, especially if the max is only about 10C above that. .... If it was my setup, I'd look at what I could do to bring the temp down some.

-Dave

I have some 120mm fans positioned in my rigs in front of the GPU cards to force feed their cooling fans some outside air.

How these things can run this hot and still survive still astounds me.

I run side off to try to get them the coolest ambient air possible.

I don't understand how you folks can cool them within a closed case.

But.....I am the local Seti nutcase, and will do whatever it takes to get the most out of my rigs that I can.

Meow.

Mine is the lower one that gets hot from the top card if I had some space at the bottom of the case I think it would run cooler.
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Also, regular dust clearing from the heatsink of that bottom card in particular may be in order with it being sat in the bottom of your case. Once heasinks become clogged temperatures quickly rise.

PCIE numbers seem to make little difference in my opinion. I run a number of multi card computers of interest here, one has 2xPCIE 16 sockets running at 16x and 4x. Two other boards have 3 slots running at 8x, 8x and 1x.

I have not been able to detect any real difference in the crunching times between those cards on the faster slots and those in the slower slots. If there is any difference, it is less than the varieations in crunching times that naturally occurs between units.

T.A.

PCIE numbers seem to make little difference in my opinion.

For 2 1/2 years, after S@h had the first CUDA app, someone made a test with his IIRC 9800 GPU and different PCIe slot speeds.
The forum search is limited one year, so not possible to find again this thread.

He had the GPU at PCIe 1.0 x16 speed.. also at
x8 and saw 3 % loss..
x4 and saw 10 % loss..

The only way for to stop the discussion and find a conclusion about PCIe speed and S@h CUDA.. would be if someone have a mobo with different PCIe slot speeds and the time for to make a offline test with bench WUs.. (for to repeat this test).

Or, someone which have same GPUs at different slot speeds in one machine (if this would be the same result)..


- Best regards! - Sutaru Tsureku, team seti.international founder. - Optimize your PC for higher RAC. - SETI@home needs your help. -
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