These are my settings for a Prime stable i7 920 system at 200 x 20 with Turbo and HT Enabled.

VCore set to 1.46xx in Bios (VDroop brings it down to 1.408) And I believe I have Loadline Enabled. I'll look to confirm on my Reboot.

QPI/Vtt set to 1.375v

Dram Set to 1.66v

Everything else on Auto.