Have mine currently running at 3.8ghz (8.5x450), 1.200 vid chip, batch no: L844C01.

vcore, 1.21875 in bios, 1.200 idle, 1.208 load
pll, 1.54
vtt, 1.26
nb, 1.26
vdimm, 2.02



The above settings were tested with small fft for 4 hours or so without issue, im gonna let it run for 8 hours or more just to be sure, if stable enough ill try a run at 4ghz.