Overclocking my 1090T, trying to keep it safe

So, I'm no OC expert, and I want to keep it safe. I have a 1090T, and am working on overclocking. Right now I have the standard voltage (1.3v) and I am wondering how much I can increase this by? I did a balanced stress test with prime 95 and got a BSOD after 4 or 5 minutes. The CPU temp was at 50C when it crashed. I had frequency at 215 and 17.5.

Can anyone tell me what voltage I should set it at? Any guidelines for multiplier and frequency? I put a very strong fan/heatsink on it. It should be good for a high overclock.

Also, I know this is the CPU forum, but how about for OCing the RAM. I remember when buying the motherboard that in the reviews I read it said I had to set the RAM to be DDR3 1600 or something (the ram I bought), because by defult the motherboard made it 1333 or something like that?

My Mobo: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
RAM: http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Thanks.