It's difficult to point out the difference between Very High and Ultra, you will not be noticing while gaming
It depends on what your monitor resolution.Also change your ram.Intel doesn't recommend using over 1.5v for RAM, but also says voltage over 1.65 will reduce the life of your processor, and possibly kill it quick, it also will void your cpu warranty.
My screen resolution is 1680x1050. Thx for fast replys
It's good enough just change the ram and you'll be golden.