fx overclock

I OC'd my fx 8320 on an asus sabertooth 990fx r2.0 board with 120mm AIO cooler. The best I achieved was 4.7Ghz with 1.45v voltage. What do you think is this a good OC and should I try to go further with maybe a 360mm AIO?

Hi, I built my first pc about two months ago and I have a problem with my cpu. When I first booted it up and such I let it go a few days until i decided to go ahead and overclock my cpu, I mean, I did just pay extra cash so that it would be unlocked. I overclocked it to 4.2GHz and didn't do...