guys just a quick question. can you use a gtx 600 series on a mobo that has pci-e 2.0? i ask as the 600 series are 3.0 but my friend is after a new card but his mobo only supports 2.0. might be a daft question i know but only just thought about it.
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Performance bump less than 5% in SLI for me. Less in single card.
I've heard some 600 cards are bugged in PCI-E 3.0 mode anyway. I'm running my GTX670 in forced PCI-E 2.0 mode to avoid any issues.
There is a problem with GTX 670/80s and X79 boards with PCI-E 3.0 but there is a hack to get around that so they can use PCI-E 3.0.