The voltage required to overclock a CPU doesn't depend on the motherboard, it depends on the CPU.

As for motherboards for your 9950BE 125w, if there was a "best one" all the others would be withdrawn from the market because everyone (at least everyone who reads reviews and forums) would be using the "best one".

I would suggest that most people are having success with Asus and Gigabit boards at the current time.

I would also suggest that overclocking a little is easy, but getting the most out of a motherboard depends less on the particular brand and more on the knowledge and skill of the overclocker.

 

I understand that, I've had this GA board for a year now, and have never been able to attain a nice stable overclock. At first, it's because I had a crappy 9500 Phenom With the TLB Erratum bug and with stock cooling. And now, from what i've come to figure out, I believe it's because my Northbridge overheats, and there also is no option in the bios to change the NB voltages so I therefore am going to be stuck in this range, with no rock solid overclocks.

EDIT:
There are also people with the same Processors but different boards that get huge differences in Overclocks, check out the OC WR site and you'll see, I reallyd o believe that the mobo plays a major role in the OC ability of a setup.

 

What is that component showing a temperature of 82C on AOD!? :O

 

This appears to be the south bridge temperature readout, try mounting a small fan or better heatsink to your southbridge. What kind of video card are you using? Large hot video cards near the southbridge will heat it up, especially If you have say, a performance class video card I.E. 3870, 4870, etc. Try turning up the fan speed on your card slightly, this should keep your card cooler and allow less heat to reach the southbridge especially if you are using a dual slot cooler.