K8N Neo2 Plat power and bios question

Question

I have a K8N Neo2 Plat. I use a UltraProducts 500W xconnect PSU and a BFG 6800 GT OC.
A couple weeks ago the 6800 died. I contacted BFG and they sent me a new one.
The new one died the same way after a week. They said to check the power levels on the +12 rail.
In windows using softare tests it reports 13.58
in the bios it reports 12.22
both are over the allowed variance.
Ultra products told me to check with my motherboard manufacturer to see if there was a BIOS setting that would let me set the power on the +12V rail. Is that possible?
Is that something my K8N Neo2 Plat can do?

Answer 1

No, you cannot lower the 12V-rail by a bios setting. I really don't see what they mean by that.
Your motherboard does, however, regulate the power that comes from the power supply. Within certain margins it can lower the voltage and keep it steady. Your videocard can do the same. Now, depending on the tolerance (quality) of your hardware, you can vary on those margins. But on any piece of hardware, there is a point on which it cannot correct/lower a voltage that is too high. It then simply shuts down or dies.
To my opinion, the PSU-maker gave you a very funny piece of advice. What he actually says is that their psu may give too high a voltage (I talk about the 13+ now), but your hardware should correct this. That's not the way it works: they should make psu's that give 12V where it should. So, I'd demand a replacement. But, before you do: use a multimeter to measure the 12V-rail. You cannot trust the board's measurement too well.
But then, like Stick  says, I think that 12.22 is within mentioned margins. 13.58V is too high. So, that's why you should first measure using a multimeter. Measure for a longer time. System idle, system full load. Write everything down and see how steady this psu is. If 12V dances arround, replace it.