What does enabling/disabling C1E & EIST do in the BIOS?

[ty1er]

I have read that if you plan on OCing your should disable C1E and EIST. Im just curious on what disabling those two settings actually does.

Thanks!

 

[Zardnok]

Quick version of what they do is, they lower your Vcore and multiplier when there is minimal load on the CPU. Disabling them may give some increased stability for overclocking. Best way to find out is to simply experiment by seeing what stable OC you can get with and without them enabled.

 

[Peter]

EIST = Enhanced Intel SpeedStep Technology. This gives your operating system the ability to switch the processor's speed and voltage up and down, to preserve power when not much is being computed.

C1E = is a power saving enhancement to the state the CPU is in when there is totally nothing to do at all. Whilst doing something productive with your computer, it spends most of the time in C1 state - and if you make it C1E, you'll save power.