Final results with my LE-1620:

ADH1620IAA5DH
CCBVF 0742 DPMW

100% stable at 3384, but no more. 3396 eventually produces Orthos errors. Random reboots begin promptly at 34xx (!)
12x282
1.47v

Arctic Cooling, Freezer 64 Pro cooler. 'Classic' Arctic Silver. 40C after 30min of Orthos. (Ambient is 14C, a rise of 26C. Fan speed seems slowish at 17xx RPM. Bios fan throttling is disabled, but I think I may need a PWM fan controller program.)

Gigabyte GA-M61P-S3

Mem and HT not optimized, running well under standard freqs.

-Moo