This thread is all about how GTLs work, knowing what you've set the GTLs for, and some good info on how to set the voltages around them. But since we're pushing the CPUs well beyond they're design ratings, this is just a starting place. Like the other voltages that we're upping, the GTLs won't be where they're "supposed" to be either. That's why I've been reading about how to tune them. What I'm finding is that 0.67 or 0.635 is not where I end up at any particular clock. Since I haven't stopped to fine tune any settings yet (when I break 4G, I'll do that before moving on), I may find that I end up there, but for lower OCs I was down around 0.635 and now up at 442 FSB, I find that I'm up at 0.68 (0.69 at 430). And NB's down at 0.62, but this memory and this MB don't seem to get along well -- the latest BIOS seems to be helping.