I don't mind using RBE to increase voltage anyway. I have 2 BIOSes, a normal one with 1.175v which yields 950 core, and another 'extreme' benching BIOS which has 1.35v and that allows about 1025 core.

Any higher than 1.35v is pointless for me, it doesn't give any considerable stability to higher clocks... due to temps i'm guessing.