will a PCI-E 3.0 x16 graphics card perform less in a PCI-E 2.0 x16 slot?

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PCIe 2.0 x16 is basically equivalent to PCIe 3.0 x8. And x8 is perfectly fine to run your video card on. However, SLI would pretty much be out of the picture for you.
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zAustin

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Oct 18, 2013
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PCIe 2.0 x16 is basically equivalent to PCIe 3.0 x8. And x8 is perfectly fine to run your video card on. However, SLI would pretty much be out of the picture for you.
 
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Rogue Leader

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Dec 22, 2014
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This is not a good comparison, the number of lanes is not directly proportional to the speed of the lanes in 2.0 vs 3.0, just how much data they can carry. Now it is true that x16 can run faster because it has more lanes and therefore can carry that much extra data, but the difference in speed here is between PCIe v2.0 and 3.0, and in reality its been proven to be only a few percentages points slower.

SLI and Crossfire run perfectly well on PCIe 2.0, in fact you'll find anyone running an AMD based system here, as well as a decent portion of everyone else on this site running an SLI/CF setup is running it on PCIe 2.0 .
 
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mnw48

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the plan is to get a budget R7 360 that can do crossfire, then add an identical twin to it later on if/when the need arises, i would go nvidia but their cards in the same price range (GTX 750 TI) dont have an SLI connector on top, a few comparison sites tell me that the 2 cards are about the same in real performance even though one has more shaders and one is clocked faster etc... so i figured id play with an AMD card for a change :D
 
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