Inconsistent Multiplier... Why, how?

Roverno · 19 Jan 2013 at 08:57

Hi all,

So i have to re-do my overclock on my pc because i accidentally hit the clear cmos button when cleaning it last week. (Idiot! i know...)

Im aiming at 4.8 as that is what had before and all the kit is the same so i see no reason for it not to be fairly simple, it is the rig in my sig.

My problem is that under load the multiplier will jump between 48 and 33 every now and then. I thought this was a current limit thing but i have them all maxed so im not sure what the problem is.

These are my BIOS settings. Hopefully somebody can give me a hand with this one??

Snapshot · 19 Jan 2013 at 09:29

It's probably just speedstep cutting in when whatever you're running pauses for a moment. Read this sticky.

Roverno · 19 Jan 2013 at 09:37

Snapshot said:
It's probably just speedstep cutting in when whatever you're running pauses for a moment. Read this sticky.

Thanks. I know about speedstep and i have always kept it on but it shouldn't change during load surely? I mean, i have tried running latest versions of P95 and OCCT and when running either test, every 30 seconds or so, the multiplier will reduce to 33. On occt im running 90% RAM and 100% cpu, how can it possible think that it is not fully loaded and can reduce the multiplier?

steve258 · 19 Jan 2013 at 09:41

Because you are overclocking using turbo mode, meaning it will only reach target turbo frequency (4.8Ghz +0.07V) when really needed, how that is determined I'm not sure. Use fixed mode overclock and disable speedstep and turbo so that cpu speed stays at 4.8Ghz all the time.

Nice overclock by the way.

*EDIT* What is the temperature like?

Roverno · 19 Jan 2013 at 09:47

steve258 said:
Because you are overclocking using turbo mode, meaning it will only reach target turbo frequency (4.8Ghz +0.07V) when really needed, how that is determined I'm not sure. Use fixed mode overclock and disable speedstep and turbo so that cpu speed stays at 4.8Ghz all the time.

Nice overclock by the way.

Thanks very much, I just tried going to the option to turn off turbo mode and you cant do it. you cant access that line to change it. Its always been the same on my asrock boards (had z68 Ex G3 before).

What i did do, is turn of speedstep just to see what effect it has. Turns out that when off it will still go back to 1v and 1600mhz and also peak up at 4800. I could have swarn thats what speedstep does but maybe speedstep enables the steps inbetween like x33??

EDIT: Temps max out at about 60 on CPU. Watercooled silence ftw

EDIT2: For the love of all thats holy.... im now running 48 at 1.392v. Speedstep seems to have changed more than i expected it to do!?!?