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Can a PCI Express 3.0 x16 work in a PCI Express 2.0 x16 PCI Express 2.

Last response: in Graphics & Displays
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July 1, 2012 7:18:14 AM

Ok so right now i have a gtx 550ti and was wondering if i could upgrade to a gtx 670. But my motherboard has a PCI Express 2.0 x16 and the gtx 670 is a PCI Express 3.0 x16. So will the gtx 670 fit or no. I also did not mean to add PCI Express 2. at the end of the title...
a b U Graphics card
July 1, 2012 7:21:30 AM

A Hamburgl3r said:
Ok so right now i have a gtx 550ti and was wondering if i could upgrade to a gtx 670. But my motherboard has a PCI Express 2.0 x16 and the gtx 670 is a PCI Express 3.0 x16. So will the gtx 670 fit or no. I also did not mean to add PCI Express 2. at the end of the title...

Yes, it will work. PCI-E 3 is basically theoretical at this point and 2.0 is just fine for all cards.
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a c 115 U Graphics card
a c 168 V Motherboard
July 1, 2012 7:29:20 AM

All PCIe specifications are forwards and backwards compatible. PCIe 3.0 uses a different encoding scheme than PCIe 2.x and 1.x but the controllers will negotiate that.
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a c 130 U Graphics card
a b V Motherboard
July 1, 2012 7:51:25 AM

There are always some exceptions, these are few and far between. Sometimes a certain motherboard wont like running X or Y GPU but generally they are all backwards compatible.
You shouldn't get issues with a 2.0 slot, it tends to be 1.1 and lower where the issues start. As I said even then very few and far between.

I just mention it so that you are aware there is not 100% compatibility right across the board. Always check if you are unsure.

Mactronix :) 
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July 8, 2012 5:37:27 AM

Best answer selected by A hamburgl3r.
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September 29, 2012 6:34:11 PM

So should I assume that PCI Express 2 cards will work in PCI Express 3 slots with no problems?

Please excuse me butting in here.
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