the AMD CPU is a crap shoot with over clocks i have got my 8350 to 4.7Ghz stable but that is not the norm 4.5Ghz should be stable with good memory and a solid GPU. When over clocking even jist the CPU, it will effect everything on the system, i use 580"s for my GPU, and corsair plat memory, i have found that the more stable the system is at stock, the higher the clocks can go.