I just recently built a machine out of a Gigabyte P35 series board and can confirm that it will do it. The build was for a business and I liked the, "heavy duty," features of it (restaurant environment).

-Ed

Bring this topic back to life! I'm sad there's a total lack of information about the bios undervolting of any of the new intel/amd platforms.

From what I know currently most gigabytes are definitely undervoltable for both amd and intel. Then it becomes much murkier as to which brands have undervolting adjustments. I remember asus had no undervolting for a long time for socket 775, but it's sounding like it's changed somewhat. Generally ecs lacks many bios options for most of their boards.

This was a great article, but sadly out of date - http://www.silentpcreview.com/article69-page1.html

I can contribute info on my boards right now:
Gigabyte GA-EP35-DS3R(and most of p35 series) - undervoltable down to I believe .85v
Gigabyte GA-G33M-S2 - undervoltable down to .85v or so.

well im trying to work this out..now

this is the same to my asus computer

http://www.jetway.com.tw/jw/motherboard ... M26GT3-SVP

Older board, no longer sold on Newegg.com, but it has some of the nicest features for a silent PC. Main features that benefit underclocking and undervolting are: manual selection of CPU multiplier and voltage. Multiplier as low as 5x. Voltage down to 1.0 volt. Unfortunately, one cannot undervolt the CPU via this method and still have CnQ. Luckily, Jetway has this feature called CPU vcore 13 shift, which basically takes the selected VID and then overvolts/undervolts by a given percentage, selected by you in the bios. That way, you can underclock the CPU to 5x multi, keep the vcore at default, and then use the vcore shift feature to reduce vcore. This allows you to successfully use cool and quiet or RMclock once in windows to further reduce multiplier to 4x and vcore to .800 volt. One thing to keep in mind though, set the vcore shift feature to no less than the max needed to achieve full desired clock speed of CPU once in windows (say 1.1 volt it running at 2.0GHz) because programs like RMclock cannot overvolt the CPU, but only run it at it's highest default vcore. For example, setting the CPU voltage to the max in RMclock, which is usually the default voltage for the CPU, will only run the CPU at the voltage set in the BIOS using the vcore shift! Since RMclock does not know the bios is changing the vcore, it thinks the vcore is at default, so your vcore shift is now running the true vcore at 1.1 volt. In this scenerio you must set the undervolted vcore to 1.0 volt to achieve the 0.800 vcore desired for 800MHz operation, and yes, you can even go just a little bit under 0.800 vcore using this vcore shift feature. I'm usually running at 0.780 true vcore. Since RMclock can't read the true vcore, Speedfan is needed, and always reports the corrected vcore. CPU-z is hit and miss, usually reported the correct vcore only if speedfan is running at the same time, for some reason.
The jetway m26GT3-svp also offers PWM fan control to slow down the stock CPU fan to ~2000 rpm. The only real drawbacks are lack of AM2+ support and the inability to perform S3 standby.

My rig:
CPU: Sempron LE-1100 @ 211 FSB (850MHz/0.780, 2.00GHz/1.1)
mobo: Jetway m26GT3-SVP
RAM: 2 x 512MB DDR667
Video: ATI x300se 64MB Dell branded card
HDD: 200GB Seagate 7 series with SATA adapter
PCI cards: Hauppauge PVR-250
Optical drive: Lite-On 16x DVDRW
PSU: Rosewill 200 watt SFX
Case: HP Pavilion (former HP 6835)
OS: MCE 2005

Power consumption, typical Load: 65 watts

Before this computer was repurposed as my HTPC, it was an internet browser, using the IGP and no capture card, idle power consumption was 37 watts, and load 55 watts cpu only, up to 62 watts with IGP+cpu load during certain games.

Not sure if it's been added already.

Up to 0.5V for the cpu and very customizable bios.
I'm liking this board very much.

Rot's 'o Ruck award an ST6 though. Like a lot of Socket 370 I815 boards they're not fabricated any more. They are not accessible new anywhere that I've apparent for the endure 4-6 months. You can occaisionally acquisition a acclimated one on egay but they're hideously expensive, usually able-bodied over $150.

Asus M3A78, this is an mATX AMD board can underclock the CPU vcore 0.775 volts with phenommsrtweaker or AMD overdrive. will accept AM2+/AM3 CPUs with DDR2 RAM. chipset is 780G. comes in integrated ATI HD 3200 that can playback 1080p videos.

MSI H67MA-E45, very small increments and the power consumption dropped dramatically when I undervolted.

ASRock P67 Pro3 MB is undervoltable, but is an enthusiastic board. Not very expensive though. Only gripe I have is with my specimen I can't use my high quality headphones (use good quality speakers instead) because I get the analog lousy connection background noise . Np with the speakers though, guess they are less sensitive, every thing else works like advertised.

LOVE the new Intel 2500k CPU.

Think that would also be so with this H61 chipset board: H61M-E33 LGA 1155 mATX
viewtopic.php?f=5&t=61895

I hope you're still hanging around here Telstar, or anyone else who might be using this mb.
Can you please let us know the CPU you use with the board?
Also, are there any fans on-board? CPU etc.?
If so, how are they noise-wise?

What about case fans that you use?

Did you mean you could under-volt down to 0.5v ?

Finally, what is the power consumption for your use?
They were mentioning scary numbers for an online review 150-200W for the CPU.

Gigabyte H67N-USB3 mini-ITX. Allows undervolting of CPU, RAM and PCH.