Hey, so I managed to overclock my HD 4000 to 1500 MHz with only 85.9375 additional mV, and it's stable. I saw many topics and stuff saying they managed stable status @ 1500 MHz with 187 mV and more. Should I lower it more, or should I leave it as it is? 1.5859 V is the Graphics Voltage at 1500 MHz. Is it okay? (It's i5-3570k hd 4000)