UNDERVOLTING FUN! CORE 2 DUO/QUAD

[Idontcare]

Originally posted by: Kai920
Strange, I set my voltage to 1.00 on the BIOS, but HW Monitor and CPU-Z is reporting the lowest as 1.14v. Am I missing something?

Your mobo's hardware may actually not support all the voltage options listed in the BIOS. The BIOS can't force VRM's to operate in regime they simply electrically can't operate.

 

[suklee]

Do you know if that's the case with my mobo? (Gigabyte DS3L)

 

[nyker96]

I think my board won't even allow anything lower than stock. IP35-E. Wish they would. But my guess is at below 1v C2Ds will probably need a heart resuscitation.

 

[Acanthus]

Originally posted by: harpoon84
Lowest setting on my P5B Deluxe is 1.1V in BIOS (1.07V actual in Windows). My E4400 (L2) does 2.49GHz stable at this voltage.

My old E4300 would go all the way down to 0.9325v on a Gigabyte P35-DS3R

 

[Idontcare]

Originally posted by: Kai920
Do you know if that's the case with my mobo? (Gigabyte DS3L)

I have that board but I don't know the answer. The only board/cpu combo I've tried undervolting with is my QX6700 on Asus P5E WS Pro where I could go down to 0.86V per CPU-Z. I try it out with my DS3L but its a work machine that I dare not monkey with until its done with its current workload (4-5 weeks).

 

[XBoxLPU]

Gigabyte DS3L and E4400 @ stock

Bios: 1.143, Windows: 1.10. Stable

Need to test even lower voltages

 

[suklee]

XBoxLPU, try setting it lower in your BIOS and let me know what the programs in Windows report the vcore as.

BTW, which programs are you using the read the voltage?

 

[XBoxLPU]

Bios, 1.1V. Windows, 1.06V

Everest and CPU-Z

 

[dug777]

According to CPU-z my G0 Q6600 in an ASUS P5Q PRO is .992v idle and 1.104v load, p95-64bit stable for two hours (after which I turned it off, that's more than enough for me ).

Idle is lower than load because I'm using the Asus EPU-6 software, which automatically alters the voltage and fsb in line with speedstep.

My machine stays in the speedstep low power state most of the time I'm using the net or office or HDTV, so my vcore is usually .992v.

I could get lower for load, but I since my computer is primarily used for office, word and HDTV, in which it stays at .992v, that's more meaningful than shaving off a teensy bit at load...

 

[harpoon84]

Woops didn't realise someone revived an old thread, posted in this one ages ago.

 

[996GT2]

I'm running my 2.4 GHz T8300 at .9250v for all of the multipliers up to 10x, and at .9375v for 11x and 12x.

Rock stable after 12 hours of Orthos at this setting, and runs SO much cooler than it did at factory vCore.

 

[suklee]

Originally posted by: XBoxLPU
Bios, 1.1V. Windows, 1.06V

Everest and CPU-Z

Hmm, that's strange, my CPU-Z doesn't report anything lower than 1.136V. Wonder if there is a setting in BIOS I missed.

Or maybe my BIOS is not updated? I am running the F4 BIOS from 04/02/2008.