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Maximus IV 2 way SLI slot placement

post #1 of 18
Thread Starter 
MIVE3.jpg

So according to the manual I should place my 2 GTX 580s in slots 1 and 4.

Would there be a significant reduction in performance if I were to place the 2 cards in slot 1 and 5 instead? If I am right, that would let me run both cards at 8x/16x on PCIe 2.0.

I would like to do this because I currently do not have a water cooling system installed and thus, spacing the cards out drops the temperature down by 10-15 degrees Celsius. Any guidance would be greatly appreciated. Thanks.
Edited by Sequincer - 6/14/11 at 9:27pm
post #2 of 18
i think you specifically need to run it in 1 and 5 for it to bypass the NF200
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post #3 of 18
very little performance loss using 8x compared to 16x. Only worry if you are using a dualgpu/single pcb card (ie. 590, 6990, 5970, etc.). If you are using the stock coolers, I would place them so that each gets a good amount of air.
post #4 of 18
Thread Starter 
Quote:
Originally Posted by Sin0822;13876638 
i think you specifically need to run it in 1 and 5 for it to bypass the NF200

Not exactly. To bypass the NF200, you need to run it in slots 1 and 4 which would give you 8x/8x on the intel board which supposedly is still faster than going through the NF200. This diagram details the speeds of the Maximus IV:

MIVE_PCIe.jpg
post #5 of 18
Wow, they mixed them lanes up good.
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post #6 of 18
Thread Starter 
Quote:
Originally Posted by tsm106;13876763 
Wow, they mixed them lanes up good.

Yeah, having both cards in slots 1 and 5 give 8x/16x respectively according GPU-Z which I think is good enough given the tremendous advantage of extra cooling for the cards. The cards idle at 36C/33C and under extreme load (furmark extreme burn) go up to 65C-70C which is good enough.
Edited by Sequincer - 6/14/11 at 10:00pm
post #7 of 18
They probably were thinking about their DCII's too.
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post #8 of 18
@Sequincer

You probably going to loose some performance if you choose to run through the NF200 with 2 way SLI.

Better to run as the manual says.


You have x16 to the NF200 chipset but you only have x8 from the NF200 chipset to the CPU but when you go through the NF200 you got a tiny delay.

Remember the 1155 socket CPU only supports 16 PCI-E lanes in @ 16GB/s no matter what you do and it´s enough unless you going to run above 2560x1600.
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post #9 of 18
Thread Starter 
According to ASUS, placing the second card in the 5th slot will yield a maximum fps decrease of 5~7.

Now given that the cards idle at 36C/33C and under extreme load (furmark extreme burn) go up to 65C-70C in slots 1 and 5, I am assuming those temps will increase by around 10C. Is that safe?

So i guess what it comes down to is whether or not 70-80C is acceptable for SLI under load or is it better to take a performance hit and go for 60-70C instead?

I currently have the haf-x case installed.
Edited by Sequincer - 6/15/11 at 3:17pm
post #10 of 18
Thread Starter 
Bump. Anyone know if 70-80C is acceptable for 2 GTX 580s? Or am I better off taking a performance hit and keeping temps down?
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