There's been some confusion over whether Abit's CPU Accelerator is merely a fancy name for support for a 1066MHz front-side bus or Abit has found a way to change the Pentium 4's otherwise-locked multiplier. According to Abit, multiplier trickery is involved, but only for Pentium 4 540 3.4GHz and 560 3.6GHz processors.
TechReport
TechReport