Hi, I have Amd Phenom2 X4 965 black edition processor fitted to gigabyte motherboard. It's stock clock speed is 3400mhz but it can be overclocked upto 4000mhz. I have increased the clock speed to 3800 mhz keeping the cpu frequency as it was,200 mhz, by default. I have set the multiplier to *19,so that 19*200=3800.That's how the calculations goes. But i am confused about the amount of cpu voltage required . By default it is 1.45v.How much shall i increase? The values in the bios list are +0.025v, +0.075 +0. 100v and so on..Pls help. Does overclocking harms the cpu?