My board, of course, has the 975 chipset but my RAM is rated 1.9-2.2v. It booted with both sticks the first time with no problems @ the board's default 1.8v. GSkill tech support told me that, much like RAM's speed rating, the voltage rating just means the RAM is guaranteed to run @ rated speed/timings with that voltage. I bumped it up to 1.9v when I manually set the timings to 12-4-4-4 as it initially defaulted to looser timings.