edc: Vista came out before the Core i7 existed. It ignores the turbo abilities of your processor when reporting MHz. It assumes a 20X multiplier because that is the default maximum multiplier for a Core i7 920. To get anything beyond 20X you need to be using the turbo capabilities of the CPU. The bios is a little misleading. When you select 21.0X in the bios, in the background it automatically switches turbo mode on. It has to.

No worries. All those other programs on your Desktop are right. You are definitely running at the full 21.0X multiplier even at full load and on each and every thread. If you plan to go any higher then it's time to upgrade to some water or move up north where I live. Almost winter time up here.