Overclocking Multiplier locked 1155 CPUs

I read an article about this, presumably on Bit Tech but for the life of me can't find it.

The article used a locked i5 and altered the turbo multis I think to get it going faster than normal. Would this apply to lower end Sandy Bridge parts as well? I'm upgrading to SB but it will be using either a Pentium or an i3 for now so was just wondering.

My Google Fu is weak today and I couldn't find anything particularly relevant.

Cheers guys.

 

You can up the base clock, but not by much since the base clock is linked to other clocks.

 

Upping the base clock isn't really recommended as it speeds up things like the SATA bus too, which can potentially degrade.

Basically, if you want to OC then get a K series part. Otherwise forget it.

 

If i remember correctly I think you can raise the base clock by about 0.3ghz. But as Parge say, its not the best idea

 

What you describe noizdaemon666 is possible. Let me explain.

• First, CPU of your choice needs to support Turbo modes. No Turbo, no fun.
• Then you can use the BIOS settings to modify the Turbo ratios. Instead of the 1-core +4, 2-core +3, 3-core +2 and 1-core +1 multipliers you set all 4 (or 2) cores to the maximum Turbo multiplier.

The result of it will be that for example i5-2300 will run on 3.1GHz constantly even at highest load instead of the default 2.8Ghz clock; i5-2500 (non-K version) will run at 3.7GHz instead of 3.3GHz.

You can also change the base clock by a little bit, but it is not recommended, because it affects clocks everywhere in the system.

 

Cheers faugusztin, that's what I was aiming for + rep

 

it's more complex than that. you can up all multipliers by 4 bins using turbo.

that means 2400 default at 3.2GHz 4 cores with the +1 turbo can run at 3.6GHz 4 cores, and 3.8GHz for 1 core. i know because im running mine at 3.6GHz 4 cores and 3.8GHz 1 core

also, the google-fu is strong here
http://www.channelpro.co.uk/reviews/6511/intel-sandy-bridge-review/page/0/13

 

Ah, I bow before your Google Fu + rep as well for further info

 

AFAIK you should be able to set all to the same, highest setting, of course with adequate cooling, provided your board gives you to set per-core Turbo settings :


Set all 4 of them to 38, and it should run x38 all the time at highest load of any number of cores, no ? Or are those limited even more ?

PS: Of course it would downclock when the power is not needed, but it should go up to the maxed out turbo multiplier instead of the default turbo multiplier for that specific core load.

 

there isn't such setting in the Gigabyte board i have, only single multiplier which as been set to maximum of 38x.

it's very locked down. as i said, 4x on top of turbo is all that's possible.

 

The i3 and Pentium models do not support turbo, so they do not overclock at all apart from the base clock.

The above info is spot on for non-k i5 and i7 however, you can up each turbo multi +4.

 

Well, then it is clear. Asus P67/Z68/Z75/Z77 boards support per core turbo settings, other manufacturers may or may not support that.

 

The Gigabyte in my sig does, would find it odd if others do not.

 

Yeah, wuyanxu's board should support it too - page 38 in the manual , M.I.T.-> Advanced Frequency Settings -> Advanced CPU Core Features, Turbo Ratio (1-core, 2-core, 3-core, 4-core).

 

So the P8P67-M I just bought off bdigital should be able to do the job

I hadn't realised that below i5s didn't have Turbo so I shall have to see what money can stretch to. I think I'll have to push for a refund on my dead motherboard.

 

Yes it does. Page 2-15 in manual.



PS: Trubo

 

just found that, set them all to 38 and when under 4 core load, it still sits at 3.6GHz.

meaning it's very locked down, only allows maximum of 4 bins above turbo frequency. (simplest way to put it)

 

@wuyanxu: one more option - in same screen try to increase Turbo Power Limit andor Core Current Limit :

Worth a try. My only locked down CPU is the Xeon in the server, and i won't reboot the server just to test it out .

 

i've increased them to 150w and 120a respectively when while i was there earlier.

trust me, it's +4 on all turbo modes.

 

Yes you cant get around the multi limits sadly.