Apparently most or all ASUS boards do not
allow undervolting p3 and p4 CPUs, they only allow overvolting for overclockers (see the recent Asus P4PE thread).
Since most CPUs are now way overpowered for a home theater PC that's only doing playback, I was thinking of undervolting and underclocking.
Anyone know of p3 or p4 motherboards that undervolt and underclock? Have you done this yourself?
Of course I can always buy some old 815 / BX motherboard and a "slow" p3, but wouldn't an underclocked tualatin celeron 1.2 run cooler than a coppermine p3 or celeron at 800 MHz?
* * * * * * * * * * * *ADDENDUM by MIKEC: Dave, sorry to hijack your thread, but I think you'll find the intent is perfectly in line with yours...
A new page called Undervoltable Motherboards
has been added to the Recommended Section
. This is a short starting list of undervolt-friendly motherboards that will be expanded over time. How quickly this happens depends on how much you help. You can each help a great deal.
The simple fact is that Vcore adjustments are usually not covered in specifications, and often, not even in manuals. In many cases, the only way to know for sure is to go into the BIOS of the motherboard and check the Vcore range available in the CPU frequency/voltage setup menu. Each and every one of you has at least one motherboard, the one in your computer. Most of you have two -- one at home and one at work. Just do a quick check on the BIOS CPU voltage adjustment range of your own PCs and report on any motherboard that provides at least a -0.2V setting from default Vcore setting.
Please submit the information to this thread. I will periodically collect the info and add it to the list below. With everyone's cooperation, we will soon have a large and useful list of undervolt friendly motherboards. If the list gets big enough, we may even divide it up into handy CPU and/or chipset categories.