I cannot figure this out and it's driving me crazy.

System as follows

Z77MX-DH3 f16d beta bios
2x4gig Kingston Genesis Ram
2x GTX660 SLI

My board will auto clock my CPU to x42 multiplier without touching anything in the bios, even set to load defaults. Changing the multi in the bios has no effect at all.

The Bios will display my CPU is running at 4200mhz in the info and in windows adia64 and CPU-z will show it changing from 16x-42x under load. no voltages change or nothing.

What am i doing wrong. I'm sure i was able to mess with the multi in bios f14. Is there a problem with bios f16d?

Some help would be really appreciated.