That's odd, I assumed drive strength just affected drive strength. So you're saying when you set the drive strength setting (profile) it changes all of the voltages you mentioned? If you manually set the voltages you mentioned, what happens when you then set the drive strength profile? Does it override the parameters you previously set manually?

@ Shiranui - with that run @ 533 FSB/640 MHz, did you have 'large system cache' enabled? What PL was that at (I'm assuming 8) and what was Ai Clock Twister, Static read control and Dram read training set to?