I always had better luck overclocking the 8320 then I did the 8350. The 8350 always seemed to run hotter at the same voltage and mhz. Like said your board is a 4+1. I doubt you can get to 4.7 and if you can I would not leave it there. Over a long period and stressed it would set the mosfets on fire. If you really want to upgrade to a better board get a Gigabyte GA-970A-UD3P, you can get the things for like 85 bucks now. But the new AMD Ryzen is coming out and you got Intel Kaby. But your talking about a new board/processor and memory.