PSU 12volt line over volting?

I tried to search for this but was having trouble coming up with any good search terms, so my apologies if this has been answered elsewhere.

My motherboard is reading my PSU 12volt line at 12.5 volts.

I was having some difficulty with my graphics card (which is now in RMA) and one of the problems the EVGA techs suggested was that my 12v was running way too high at 12.5 volts.

I've done some google searches and can't really find any information on this. I wouldn't trust any body at the PSU company anyway.

Is 12.5volts too high? I know motherboard readings are not the most accurate, but I'm consistently reading between 12.48 - 12.52 volts.

My PSU is here:

OCZ ModXStream Pro 700 Watts
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341018

Should I be worried?

Measure with a DMM if you want to be sure.

Initially none.

After two days, major instability (no changes) and constant bluescreens with failure to reset device drivers or something along those lines.

After such a dump, could not log into Vista 64 (could get to the user-selection screen, no further). Could boot fine into safe mode or with the card removed and using the on-board.

By the end of the day, with the card installed, I was artifacting immediately on boot.

12.4V is well within spec. (11.4V to 12.6V)

Thanks a lot guys.