212 EVO is probably not good enough to get a 4.5Ghz OC out of any of the FX8 cpus, at least not without the system being incredibly loud all the time. 4-4.2Ghz is probably the best you can hope for without either putting up with excessive noise or getting a better cooler. Still, it's an option, and even at 4Ghz (Stock setting for the 8350 or 500mhz OC for the 8320) you'd see some gains.