C states changing voltage/multi?

[hwJunkie]

I tried disabling three options in my xtreme3 gen3 bios to see if it would stem the multiplier fluctuations in my 2500k.

CPU C3 State Support
CPU C6 State Support
Package C State Support

When disabled my voltage at idle jumped to 1.33v, even though offset was set to only +0.05.

I think it helped a bit with the multiplier fluctuations, but I didn't like that idle voltage.

I enabled the options and idle is at 1.0v now.

I'm just not sure about whether I want this option enabled, or why when disabled, idle voltage skyrockets to 1.33, then when under load back to 1.280.

I also don't like it that I can see the multiplier go from 41-44x under cpu-id under prime95.

I mean what if I'm playing bf3 and c state just decides its time to decrease my multiplier? Is c state doing that?

If it doesn't think there's enough load to keep my multi at 44 under prime95, it won't when I'm gaming.

=/

I also have spread spectrum set to auto right now, if i disable it KABOOM

 

[Forceman]

If you want to disable it, you need to turn off C1E and EIST - those are the primary ones that control voltage/multipliers. But really, there isn't any need to disable them - it will only downclock the CPU when it isn't loaded down, if it needs to be at the higher multiplier, it will be.

 

[hwJunkie]

alright thx

 

[keto]

Not sure if I know what you mean by multi fluctuations, but there is a setting in bios that limits how much power input/output your cpu can have and, under load, if it exceeds the threshold it will drop the multi. So, you're running prime at 4.8 and all of a sudden your computer is showing 4.4 or whatever. I can't remember what it's called, I think you have an ASUS board, but if this is the issue you should be able to find it easily enough. I think maybe ASUS goes by %, on Giga I can actually raise it by number - default is 95 but most raise it to 200-250 for overclocking.

If you mean it's dropping to 1600 at idle, it's designed to do that.