Not sure since I'm at not at home at the moment but I think I have that motherboard and if I don't it's very similar. It works fine with a large graphics card.
Pci-e x16 3.0 is backwards compatible and will not lose performance. The slot type refers to bandwidth and currently we do not lose any performance using a 3.0 card on 2.0/2.1.
Will this be enough to run at least a game like Counter Strike on medium?
Yes most likely. See CSS/1.6 run on dx9 at most and if the card is dx11 it will run dx 10 and 9 much easier. Pretty much takes less to render dx 9 for a dx11 card. Don't expect more than low.
This guy is playing Rage on low and it seems playable. System is similar to yours. Granted he has the 512mb and you are getting the 1gb, higher res will be easier. He said he got 40 - 60fps all around without fraps on.
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