What is the difference between PCI Express x16 and PCI Express 2.0 x16???
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What is the difference between PCI Express x16 and PCI Express 2.0 x16???
PCI-e 2.0 is theoretically twice as fast as "plain" PCI-e.
And as far as I can remember PCI-e 2.0 port also provide a little more power to your graphics card, but do not hang up on.
However, there are not more cards in the market that can fully exploit v2.0.