R9 280x PCI-E 2.0?

I am wanting the new asus direct CU II version of the new AMD R9 280x but my motherboard (Gigabyte 970A-DS3) is only a PCIE 2.0 mobo. I know that current gen GPU's work no bother but not sure if this one will, and if it does will there be a great performance difference? 

Help much appreciated 

You're fine. It's only dual GPU solutions that start to bottleneck gen 2.0

*wipes brow* Thanks for that mate, cant wait to get this badboy, gonna be a hell of an upgrade from my GTX 650 :P

If you wanted to crossfire the 280X, gen 2.0 is still suitable.

Enjoy it.

Thanks, only problem is that only other available slot is 4x so wouldnt be ideal, but if i was spending that kind of cash I would upgrade the mobo anyway :)