P55M-UD4 i5 750 multiplier question

[slybunda]

hey all, got a question regarding the multipliers available on this motherboard and cpu combination.

if turbo mode is enabled and all 4 cores are loaded the cpu uses a 21x multi. however if 1 or 2 cores are only loaded then the system will use an even higher multiplier, up to 24x to turbo boost the 1 or 2 cores being used.

question is can i permalently use the 21x multiplier without it going up to 22,23,24x for single and dual core loading?

thanks.

[Dark Mantis]

It is possible to overclock your chip and limit it to whatever you set the multiplier to(within certain restrictions) but to do this you would have to manually make all the settings. I am not sure that it is possible to do any other way.

[slybunda]

i currently run 180x20 for 3.6ghz, if i enable turbo when all 4 cores are loaded in linpak clock speed turbos up to 3780mhz since the 21x multi becomes active.

but if i lock linpak's threads to 1 or 2 max then the 24x multi takes effect and that makes the cpu unstable since clock speed is boosted heavily.

is there a way to just have the 21x multi in effect without it turbo boosting to 24x?

what settings would i need to use to get it to work if its possible?

[Peteruk]

I have a GA-P55-UD4 and a problem I had was Turbo Boost not working when enabled but it locked the multiplier for my i7 860 to x22 @2.9MHz (which should be x21 @2.8MHz) on all core without changing.

The setting that stopped Turbo Boost from working was C3/C6/C7 State Support to Auto when set to enable Turbo Boost worked.

So what should work for you is to enable Turbo Boost and set C3/C6/C7 State Support to Auto with the multiplier set to x21 on all cores for your i5.

[slybunda]

disabling those C states resulted in turbo mode being disabled and max multi of 20 was only available.

[slybunda]

sorry my mistake, i didnt read your post properly, insted of putting C states to Auto, i disabled them.

i have now put them to auto and its working exactly as i wanted it to. i can use 21x multiplier, when i run linpak, be it single thread, 2 thread or 3 or 4, the multiplier goes to 21x and no longer goes to 24x.

so now i get speed step going from 9x to 21x multiplers in various increments.

thankyou for your assistance in this matter, this was exactly the result i was after. now i can go play some more with the overclocking without going too high on baseclock.

[Dark Mantis]

It is all much more complicated nowadays to get a stable overclock with all the extra settings, onboard memory controllers, etc.

[slybunda]

tell me about it, i got error in linx last night at around the 7 hour 33min mark. i dont think its vcore related, if it was the error would have occurred a lot sooner. i think the main culprit is the vtt voltage. can only increase and try again.