Ace, what do you consider "low" vcore? Highest I have taken mine is 1.35 in uGuru and that gives me 3.6, 8x450. I have the Ultra 120 Extreme and I have done your bolt mod. My PMW temps are not as low as yours but I do not have a fan on the pmw sink yet. I need to mod my side fan bracket to clear the u120 before it will close yet.