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gtx 580 pcie lanes

post #1 of 4
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currently I am running my 580's at x8/x8, how much of a performance hit would the third one take running at x8/x8/x4?
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Little Man
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post #2 of 4
don't bother. you can't do Tri-SLI on that board
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Kill Bill
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post #3 of 4
Quote:
Originally Posted by SoliDD View Post

currently I am running my 580's at x8/x8, how much of a performance hit would the third one take running at x8/x8/x4?


Running at x4 will not allow a GTX580 to stretch its leg.  In other words, a 'waste' is introduced.  This 'waste' translates into a 'drop' of framerate, relative to the framerate by a GTX580 on a x16 slot.

 

But the big question is:- is this 'waste' or 'fps drop' large enough to 'negate' the fps gain by going from 2-way SLI to 3-way SLI?

 

It is hard to answer precisely.  Tom's and TPU both have some study in a single GTX480 and the 'loss' is from 7% to 20%.  This is certainly a significant loss.  However, the % gain from 2-way to 3-way SLI is also a 'significant' as well, in general.

http://www.tomshardware.com/reviews/pcie-geforce-gtx-480-x16-x8-x4,2696-9.html

http://www.techpowerup.com/reviews/NVIDIA/GTX_480_PCI-Express_Scaling/24.html

 

Additionally, this is not just a question of technical performance but also a question of cost as well.  If it turns out that there is a 'net' gain, the question to ask becomes:- is this gain worthy of the cost of a 3rd GTX580?

 

In general, I would avoid using x4.  But I suggest you to do this practical test which should shine a little more light into your situation.  Put your current 2nd GTX580 into the x4 slot and run 2-way SLI with some game benchmarks.  This test should reveal how much or how little a 2-way SLI system suffers with a x4 slot.  You can then use this to extrapolate to a 3-way SLI system.

 


Edited by windfire - 1/8/12 at 7:35pm
post #4 of 4
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