On air i can boot at 360 with dual and 390 in single. I use elpida bbse at 1,8v, if i raise the dram voltage over 1,85 i lose stability/ dual. If you boot at 420 you can reach at least 450 in windows! With hypers i can boot at 345.
I use all voltage at stock exept vcore 1,75, 1,5v on cpu-nb and 1,8 dram. I'll try to raise vdda and vddr :)