The "Undervolting" Guide

[Nerolite]

Hey

I seem to be unable to engage IDA on my computer, the box is greyed out. I've got an Intel P8400 processor and running Windows Vista 64 bit.

Any suggestions?

Martin

[Kaze105]

I don't have the complete history of what you've already done but I do know that simply unchecking the SLFM box does not reset the other voltages. Since I don't know the model of your CPU, I'll take a wild guess and suggest that your CPU is locked in at 1.000 volts at the lower limit. RMC cannot override that. Why don't try my suggestion and post a thumbnail of the RMC monitor graphs. We can proceed from there.

I do believe you are correct in terms of the CPU being locked. I have a Intel P9700 which intel ranges the voltage 1.012V-1.175V.

Also, i know i am doing something wrong, so just tell me from where i am wrong.

I went to profile and unchecked everything but the IDA 11x box. I turned down the voltage for 1.0750 as i dont have a 1.065 V. As soon as i clicked apply, i got a blue screen.

[scott.ager]

I do believe you are correct in terms of the CPU being locked. I have a Intel P9700 which intel ranges the voltage 1.012V-1.175V.

Also, i know i am doing something wrong, so just tell me from where i am wrong.

I went to profile and unchecked everything but the IDA 11x box. I turned down the voltage for 1.0750 as i dont have a 1.065 V. As soon as i clicked apply, i got a blue screen.

Sorry, there's no standard recipe book for every CPU, especially your newer P9700.

Check your Adv. CPU settings against my thumbnail.

Raise the 11X voltage up 0.025 volts at a time until you don't BSOD anymore.
Then, you're all done.

[2un@]

Thanks for the Guide info
Heres my results for a P7450 2.13GHz
Voltage appears to be locked below 0.925V..CPUgenie will take it lower but no lower voltage registers with CPU-Z and temp no longer lowers as well.

My highest voltage was 1.138V and is now set at 0.962V
All rest below that 1 are now 0.925V
Has lowered my loaded CPU temps 6-7 DegC(from 71/72 to 64)

There is a september release of CPUgenie out (V1.3) Its not without the odd hiccup but i think its got some good potential especially if some guys here got behind it.
Worth a look as an option for Intel users anyway.
My TJMAX settings for this P7450 needed to be adjusted to 90 to read correct temps.

Original



Undervolted

[E.B.E.]

Sorry, there's no standard recipe book for every CPU, especially your newer P9700.

Check your Adv. CPU settings against my thumbnail.

Raise the 11X voltage up 0.025 volts at a time until you don't BSOD anymore.
Then, you're all done.

Just an (important!) note. You're not all done once you no longer get BSODs. You need to thoroughly test stability.

Moreover something I have noticed. Running stable in Orthos is NO guarantee that the CPU is stable at that voltage. I have also tested by solving very large systems of linear equations in Matlab (that stresses the CPU a lot by calling some low-level routines from the LAPACK package, written in Fortran) and it has errored out on voltages that were stable in Orthos.

So it is ALWAYS important to increase the voltage one step from the lowest one that seems stable (or in any other application for that matter; error conditions that did not appear in Matlab can appear elsewhere).

[scott.ager]

There is a september release of CPUgenie out (V1.3) Its not without the odd hiccup but i think its got some good potential especially if some guys here got behind it.

Yes. I tried it. It's better but it still has a problem (with my T8100 anyway) holding on to the FID and VID settings over time. It's been that way since the beginning. If it just had the "Iron Grip" like RMC, I'd switch in a New York minute

[ikjadoon]

EBE:

Totally true. Even hours on Orthos is not stable for me at some voltages! It's so weird.

~Ibrahim~

[tufty1974]

Yes. I tried it. It's better but it still has a problem (with my T8100 anyway) holding on to the FID and VID settings over time. It's been that way since the beginning. If it just had the "Iron Grip" like RMC, I'd switch in a New York minute

I had the same problem with my P7450 and CPUGenie v1.3 until yesterday. I posted a message on the support forum at www.clockmod.com and within hours the Admin there had posted a new version (1.3.1) that keeps the VID settings after a sleep/hibernate resume, which was the problem I had.

All seems good now, only time will tell if it's truly stable, but the 3 cylces of sleep I put it through last night all recovered fine, whereas with v1.3 my VID would have been back to 1.113 (or something close to that, I am not on the laptop at present and can't recall the exact stock volts).

My P7450 seems stable at 0.9625V at 8x clock, so hopefully it will prove to be good at that long term.

[kalawera]

I've been trying this guide for a 10th time at least and always I can't get past "apply settings at start up". Rmclock window disappears after the reboot warning, but the monitors are still down at the task bar and no reboot follows. I need to kill the prosses myself in order to start it again, but I can't save any settings. Any ideas?
HP HDX 18-1103EA, Q9000, Vista x64

[scott.ager]

I've been trying this guide for a 10th time at least and always I can't get past "apply settings at start up". Rmclock window disappears after the reboot warning, but the monitors are still down at the task bar and no reboot follows. I need to kill the prosses myself in order to start it again, but I can't save any settings. Any ideas?
HP HDX 18-1103EA, Q9000, Vista x64

Are you using the special 64 bit driver offered somewhere on this thread ?