I am selling a computer that has both. The 6950 is an XFX reference version. I had a liquid cooler on the CPU and had it overclocked to 3.2 with absolutely no issues. However, the person I am selling to is nervous about having liquid inside his computer so I am putting in a low profile air cooler I have laying around instead. With the lower performance cooling I do not want to OC. I guess I'll just give it a try and watch the temps and see.