The "Undervolting" Guide

[gengerald]

I would love getting errors instead of those dam bsods, hehe.

[eleron911]

The only thing is that you have to test every multiplier individually. And that`s what gets me.

[flipfire]

Try undervolting a T2500... it has 6x to 15x multipliers. I gave up after the 3rd multiplier and just selected voltages by instinct

[zipx2k5]

I managed to undervolt my T7500 to 0.975V at 11x, giving it only a 0.04V delta between highest and lowest speed settings. It lowered temperatures from 81C to 65C at load. Has been running rock solid for 3 months at this voltage, and I can actually push it even lower to 0.962V, but I experience (very rare) BSOD's at that level. I'm just surprised at how low a voltage it could go.

[John Ratsey]

The only thing is that you have to test every multiplier individually. And that`s what gets me.

I just have the lowest VID as low as it goes, find out the safe VID for the highest multiplier and let RMClock's auto-adjust intermediate VIDs do the rest. 90% of the time the CPU is running at either its fastest or slowest speeds so tweaking the intermediate voltages is only worth the effort if you create a profile which locks the CPU at an intermediate speed.

John

[gengerald]

I think the guide says to not click the Auto button under profiles, can you explain what the option does?

[John Ratsey]

I think the guide says to not click the Auto button under profiles, can you explain what the option does?

The Auto option infills the intermediate values linearly once you have fixed the highest and lowest. For example, I for my T7200 have 6x @ 0.95V, 12x @ 1.05V, so it automatically makes 9x = 1.0V.

It's possible that the intermediate voltages could be a little lower than provided by approach this since they are less onerous conditions. However, I prefer to put my effort into an overnight test for the maximum multiplier since that's the case where the CPU is most likely to spend time under full load. Maybe the guide encourages people to practice the configuration the hard way as a good learning experience. I'm several years down this learning path so I prefer the short-cuts!

John

[gengerald]

Thank you for the information. I am tempted, but I suppose I am still at that learning state.

[brainer]

hmm do you guys think that i can undervolt my t7200 CPU, i have the alienware m9750, and whats holding me back is that my CPU is overclocked to from 2ghz to 2.25 , so i dont think its possible to undervolt is it? all what i'm looking for is 2-3 degrees decrease in heat thats all

[John Ratsey]

You can only try. 2.25GHz isn't a big overclock and you might find that the CPU is still stable at 0.05 or even 0.1V below the default setting (which is what?).

I once overclocked a T2250 from 1.73GHz to 2.5GHz, but didn't undervolt at the same time. A lot of these Intel CPUs have a lot of headroom, but some don't. It's the luck of the draw.

John