Re: PSU, mobo, and FX5700 Ultra
12.47 doesn't seem that high to me. I don't really know the tolerances of different pieces of hardware, but I wouldn't think that a brand new video card would die immediately because of 12.47v on the 12v rail.
It is possible that the PSU is damaging your cards, but its not real likely. The 5700 doesn't have an external power connector does it? Its just powered straight from the AGP slot. I think you'd probably have other failures before it took out your graphics card. It seems more likely that you just got another bad card. It happens all the time.
And your 400W unit should be more than enough for that system. I ran an Athlon 64, 2 optical drives, 2 hard drives and a 7950GX2 off of a 420W Antec power supply for 2 weeks while waiting for a replacement power supply to arrive. That unit only had a single 12v rail with 20a. You should have no problems unless the PSU is actually defective.
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