Undervolting an Asus A8V Deluxe

padmewan · Post by **padmewan** » Thu Aug 11, 2005 10:39 am

According to this SPCR article, my Asus A8V Deluxe should be undervolt-able; however, I see nothing in the BIOS to enable me to do so; only overclocking options. I tried searching these forums but found only 5 oblique discussions about this mobo.

Finally, I have a simple question that I can't find a direct answer to (or lack the intelligence to decipher

) : can you undervolt and still use straight Cool 'n Quiet in vanilla Windows XP (no Crystal CPUID)?

Feyrhel · Post by **Feyrhel** » Thu Aug 11, 2005 11:34 am

If you turn off Cool 'n' Quiet, while in the BIOS, a new option to adjust CPU voltage should appear in the voltages section and let you undervolt to your heart's content.

padmewan · Post by **padmewan** » Thu Aug 11, 2005 12:50 pm

I see... so it sounds like I can have undervolting OR I can have Cool 'n Quiet but I can't do both. Unless I try something like Crystal CPUID (which, when I read the instructions here, seems really scary!).

Feyrhel · Post by **Feyrhel** » Thu Aug 11, 2005 1:38 pm

Yea, I thought CPUID was a bit overwhelming at first.

What CPU are you running? I have the same board as you and am running a 3000+ Winchester at the following settings:

200x5 @ 0.950V for the minimum

200x9 @ 1.150V for the maximum

padmewan · Post by **padmewan** » Thu Aug 11, 2005 7:12 pm

I am also running a 3000+ Winchester. Are those settings from CPUID or with default CnQ?

Feyrhel · Post by **Feyrhel** » Thu Aug 11, 2005 7:32 pm

Those are the CPUID settings.

padmewan · Post by **padmewan** » Fri Aug 12, 2005 4:12 am

Since you and I have the exact same motherboard and CPU, would it be safe to assume that those numbers will work for me as well, or do I have to go through the same stability tests recommended in the article?

vertigo · Post by **vertigo** » Fri Aug 12, 2005 4:37 am

200x5 @ 0.950V for the minimum
200x9 @ 1.150V for the maximum

Have you tested that those settings are stable? 1.15v seems rather low, considering the official voltage is 1.4v.

Feyrhel · Post by **Feyrhel** » Fri Aug 12, 2005 12:57 pm

Not really, the most I've put it through is a few hours of heavy gaming. When I had my old 300W Fortron PSU powering everything, I could not go below 1.200V under load without the computer randomly rebooting during a game. However, after installing an S12 500 I decided to drop the voltage a little bit more to see if it was a bit more stable than the Fortron's, and so far so good.

Jan Kivar · Post by **Jan Kivar** » Sat Aug 20, 2005 8:36 am

vertigo wrote:
200x5 @ 0.950V for the minimum
200x9 @ 1.150V for the maximum
Have you tested that those settings are stable? 1.15v seems rather low, considering the official voltage is 1.4v.

I don't think so. Currently testing a Sempron 3300+ system (E6 stepping), and it's Prime95-stable @ 2000 MHz/1.125V (though CPU-Z reports 1.152V?).

Cheers,

Jan

StarfishChris · Post by **StarfishChris** » Sat Aug 20, 2005 1:05 pm

n.b. you can't go below 1.1v (with a Venice, at least). It could be that the Sempron doesn't go below 1.15v - if you set it to 1.1, does the voltage change in CPU-Z?

Jan Kivar · Post by **Jan Kivar** » Sat Sep 24, 2005 3:13 am

StarfishChris wrote:n.b. you can't go below 1.1v (with a Venice, at least). It could be that the Sempron doesn't go below 1.15v - if you set it to 1.1, does the voltage change in CPU-Z?

Sorry, missed this post.

Yes, it does change. The sensor chip overreports all core voltages by .02-.05 V, currently with GNU/Linux I see 1.15V and 1.45V with lm_sensors.

Cheers,

Jan