hi, i want to update my GPU to either HD 7850 2GB or GTX 660 2GB, my CPU is AMD Athlon II X4 (Quad 3.0Ghz)
will there be any bottleneck issues as i know i dont have the best CPU in the world
It depends on what you'll be using the system for. If you primary use is gaming, then you'll be fine. If you will be doing a lot of high definition video editing, then the CPU will be holding you back.