My i7 920 CPU has automatic CPU voltage (vcore) and this is standard about 1.13 volts with 21x133 - the 21 is the clock ratio and the 133 is CPU host frequency (could be called QPI/Bclock/bclk).
The CPU actually has a ratio of 20x for each CPU core but one core will run at 21x in turbo mode (or something like that :p) - the i7 CPU has 4 cores. My i7 CPU is therefore 20x133 = 2.66MHz but I have it overclocked to 20x190 = 3.80MHz
Some Bios may not allow you to change these values. I think you can try reducing the clock ratio first and reducing the CPU voltage. I doubt you can do any damage to the CPU by reducing voltage because its designed to work at a higher voltage but you may loose stability as you reduce the voltage. Try using LinX to stress the CPU at 100% useage to test for stability.
I think if you turn on all power saving features you'll automatically underclock the CPU until it needs more power.
Firstly what CPU and motherboard are you using?
My i7 920 CPU has automatic CPU voltage (vcore) and this is standard about 1.13 volts with 21x133 - the 21 is the clock ratio and the 133 is CPU host frequency (could be called QPI/Bclock/bclk).
The CPU actually has a ratio of 20x for each CPU core but one core will run at 21x in turbo mode (or something like that :p) - the i7 CPU has 4 cores. My i7 CPU is therefore 20x133 = 2.66MHz but I have it overclocked to 20x190 = 3.80MHz
Some Bios may not allow you to change these values. I think you can try reducing the clock ratio first and reducing the CPU voltage. I doubt you can do any damage to the CPU by reducing voltage because its designed to work at a higher voltage but you may loose stability as you reduce the voltage. Try using LinX to stress the CPU at 100% useage to test for stability.
I think if you turn on all power saving features you'll automatically underclock the CPU until it needs more power.
I'm no expert so this is just my opinion