Originally Posted by MicroMiniMe
I understand what you're saying but my current PSU and previous 430 watt Seasonic both show over 12v. From what I've read, not that I've experienced, it's that overclocking with the IGP is harder (clock speed not multiplier). His 11.88v might be fine but Chieftec isn't a PSU that I've ever seen recommended for OC'ing enthusiasts. I'm surprised that your Corsair 750 watter shows 11.90v. Again, like I said I'm no expert.
Well, Right now I'm on an IGP and had no issues overclocking(RMA'd my GTX 260 to EVGA). And actually, It went up since then haha...It's at 11.97V now lol.. As long as you're within about 5% of 12V it won't effect much...Most newer PSU's have voltage protection for this(If it gets to low or to high it shuts off).
I do agree I wouldn't ever suggest or recommend a Chieftec PSU for Overclocking, especially since his PSU isn't 80 plus certified.