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Perhaps I'm trying to push my mobo too hard, but I think I have read that PCI-e 3.0 is back compatible to previous PCI-e specifications. But 3.0 into a 1.0, is it possibly asking too much?

I'm thinking about buying an AMD Radeon HD 7750. My mobo is an Asus p5g41-m le

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up vote 4 down vote accepted

Yes, PCIe 3.0 is backward-compatible with all prior PCIe implementations. http://en.wikipedia.org/wiki/PCI_Express#PCI_Express_3.0

However, because PCIe 1.0 maxes out at 2.5 gigatransfers per second (GT/s) vs. PCIe 3.0's 8 GT/s, your video card may not perform as well as you would expect when installed in a PCIe 1.0 slot.

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If the card doesn't work in a PCI-Express 1.0 slot, it's not a PCI-Express 3.0 card. –  David Schwartz May 22 '12 at 0:18
    
I rolled back my edit, but it still doesn't hurt to purchase from a seller with a generous return policy in case you're unfortunate enough to get a "PCI Express 3.0" card that isn't fully compliant with the spec. –  rob May 22 '12 at 1:12
    
It worked perfectly. So, yes, it's fully compatible. –  Karolinger Sep 15 '12 at 1:38

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