nah not on an amd processor. when you go with an amd mobo and processor, it is better to go conservative than risk bottlenecking. unless you plan on changing to intel cpu in the near future, get a radeon 7850
Do you have benchmarks showing a 660 bottlenecking but not a 7850? They're pretty close performance-wise so if one bottlenecks, I'm pretty sure they both will. To be honest though, I think that processor should be ample for these cards.