I actually ran my card at 1.52v for a very short period of time, enough to see green artifacts all over my screen at 1400mhz. 1350mhz ran fine at that voltage though! I'm darn pissed that I can't even break 1400 with ridiculous voltage on one card, whereas others have gotten 1411 on 1.26v or something. And angry people do crazy stuff I guess
EDIT: @DPH: In artmoney, the green arrow brings all addresses from the left side to the right side. From there, just double click the value of the 00449000 address, type in new value, and press enter. after that, go to msi afterburner and change something else like fan speed, and press apply. worked for me.