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Is PCIe x16 Gen 2 fast enough

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#1 RB_Kandy


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Posted 15 December 2014 - 09:09 PM

I'm looking at different builds when I noticed that AMD's AM3+ socket motherboards can't run PCIe Generation 3 controllers.

So I was was wondering, if I were to buy the two fastest graphics cards on the market and SLI them in PCIe gen 2 expansion slots, will this bottle neck their performance?

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#2 gavinseabrook


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Posted 16 December 2014 - 02:06 AM

Not noticeably. There is not too much difference between PCIe gen 2 and gen 3. You may see a drop in about 1-4 FPS between the two but it definitely wont be noticeable. If you are looking for the two fastest cards on the market though, what would benefit you more, is going with an X99 platform with a new Haswell-E processor (not the i7-5820k) because the newer processors have 40 lanes of PCIe communications allowing for both of your cards to run at 16X speeds. This will give you a boost of about 10-15 FPS in games and since they will be PCIe Gen3, you can expect another 1-5 on top of that. The newer parts for the mobo and cpu are expensive as heck, but would you think it is worth it for the extra 15-20 FPS on ultra settings in all your games? I know I would :P

Gavin Seabrook


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