PCI-E 3 SLI on PCI-E 2 Mobo

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Wrathinside

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Oct 23, 2013
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I've read plenty of threads stating that PCI-E 3 is nothing special, compared to PCI-E 2, that they are backwards compatible and not worth upgrading. Still, the majority of them are from year 2011-early 2013, and since now a real lot of cards support PCI-E 3 by default, as well as majority of Intel Mobos - has anything changed? Any newer details of productivity?

I've also read that PCI-2 only supports up to 8x bandwidth or something. May be a bit misled here, but just to make sure: will 2x PCI-E 3 GPUs(namely GTX760) SLI properly on PCI-E 2 Mobo, that supports 16+16 or 16+8+8? Mobo is SABERTOOTH 990FX R2.0.

While Sabertooth seemed like best-budged for AMD build, Intel had a lot of weaker overall(mhz\SLI) Mobos, which on the other hand support PCI-E 3.

What will be better in the upcoming years, SLI of PCI-E 3 cards on PCI-E 3 Mobo with 8+8 or 16+16 on PCI-E 2 Mobo?

I've seen http://www.tomshardware.co.uk/forum/314136-33-tomshardware and it's follow-up http://www.tomshardware.com/reviews/p67-gaming-3-way-sli-three-card-crossfire,2910.html , but it's a bit too much information to read and understand.

Is there an easier answer, is 16x+16x much better than 8x+8x? With GTX760? On PCI-E 2 or PCI-E 2 Mobo?
 
Solution
dannylivesforher
As a matter of fact,3.0 and 2.0 doesn't differ much in performance. So the SLI would be no different. And,PCI-E are of course X16. Well,the PCI-E 2.0 running at 16X=PCI-E 3.0 running at X8. That'll be the difference.So,the 3.0 will be better in bandwidth. You won't notice the difference between 2.0 and 3.0 unless you use some GPU computing app that can take advantage of the extra bandwidth
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dannylivesforher

dannylivesforher

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Sep 21, 2012
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As a matter of fact,3.0 and 2.0 doesn't differ much in performance. So the SLI would be no different. And,PCI-E are of course X16. Well,the PCI-E 2.0 running at 16X=PCI-E 3.0 running at X8. That'll be the difference.So,the 3.0 will be better in bandwidth. You won't notice the difference between 2.0 and 3.0 unless you use some GPU computing app that can take advantage of the extra bandwidth
 
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dannylivesforher

dannylivesforher

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Sep 21, 2012
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You're welcome....In fact,I was worried about this 2.0 and 3.0 thing as well,while buying my 650. My boards had 2.0 and I was worried. But forums said it wouldn't make much difference,and there'll be only some 2 or 3 fps difference. So I bought the 650,and it performs pretty decent on the 2.0,with no troubles... :)
 
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