Question How to limit turbo boost clocks

[karasahin]

Hi,

My CPU has a base clock of 2.5 GHz and with turbo it reaches up to 3.1 GHz max for one core only and 2.9 GHz for all cores.

I'd like to tweak them like this: 2.9 GHz for one core and 2.7 GHz for all cores.

Intel XTU doesn't allow me to change those values, and ThrottleStop wasn't helpful either.
(Or at least I couldn't do it)

Is it possible to do it? Thanks.

 

[rgd1101]

what is the cpu?

 

[karasahin]

what is the cpu?

i5 3210m

 

[_D_D]

Usually done through MSR 0x1AD however a published cpuz report shows bit 28 of MSR 0xCE at 0 meaning programmable turbo ratio limit disabled so probably SOL unless messing with BCLK which is usually undesirable because of stability and other clocks being affected.

 

[karasahin]

Usually done through MSR 0x1AD however a published cpuz report shows bit 28 of MSR 0xCE at 0 meaning programmable turbo ratio limit disabled so probably SOL unless messing with BCLK which is usually undesirable because of stability and other clocks being affected.

Indeed sounds complicated and troublesome. I wish it was as simple & stable as disabling turbo by just setting max cpu percentage to 99% on Windows settings.

 

[karasahin]

I guess there is really no easy way to achieve what I want. Feel free to reply if you think there is. In the meantime I'll leave turbo on for browser surfing etc. and turn it off during gaming.

Edit: I don't have this thing enabled for me (thanks HP), but it looks like it should do the trick. Can't say for certain. I'll leave this pic here in case I need it for my next laptop later.

 

[deddoshotto]

I wanted to do the same thing and the Speed Shift EPP helped me with it. Checked the box and started from 200 downwards. So, 200 was base clock speed which is 2.2Ghz for me. 180 went up to 2.6Ghz and so on. I finally settled on 160 which gives me 3.1Ghz. I don't know what it is and what those numbers are but it worked for my CPU. I have a i7 14650hx. Hope it works somehow for you too.

 

[Roland Of Gilead]

Hi,

My CPU has a base clock of 2.5 GHz and with turbo it reaches up to 3.1 GHz max for one core only and 2.9 GHz for all cores.

I'd like to tweak them like this: 2.9 GHz for one core and 2.7 GHz for all cores.

Intel XTU doesn't allow me to change those values, and ThrottleStop wasn't helpful either.
(Or at least I couldn't do it)

Is it possible to do it? Thanks.

Why exactly do you need to do this? What are you hoping to achieve? Underclocking the CPU by 200mhz, will not have any effect at all. It's not gonna suddenly make your chip super efficient or anything.

In terms of TS, sadly if you cannot access those settings, there is little you can do. Some OEM's lock down the bios, so you can't do these things. It's a real pain in the butt. It might be worth updating to the latest bios available, it might unlock it.

Also, you might let us know what your PC specs are.