Decided to join the fun and milk what I have left of this 1366 setup. Scored a brand new chip for $85 which is amazing. I can confirm that the standard Asus P6X58D-E detected the CPU as well (bios 0803). Its replacing my i7 930 which ran at 4ghz w/ 1.25qpi & 1.28 vcore.
Current setup:
Asus P6X58D-E
Intel Xeon L5639
GTX 670
Corsair Vengeance 12GB (9-9-9-24)
Corsair TX750W
After messing with the settings for a bit (no SUPER), I reached 3.4 without a hitch at 1.21 Vcore, 1.25 QPI & 1.5vdimm. To reach 3.6 I had to bump QPI up a bit & vdimm to 1.64. Anything over 3.6 requires a significant boost to QPI & Vcore. I am currently at 3.8 w/ 1.32 QPI & 1.27 Vcore. Going to try and push it further. I never really liked going beyond 1.3V on my 930, I feel like that might be a bit high, what do you guys think?
Is the 200mhz boost worth the .1 increase in Vcore & QPI? Also what are the advantages/disadvantages of SUPER? and what are optimal settings? I have never used SUPER before just always manually configured my overclocks.
EDIT: I have booted at 216x18 3.9hghz w/ 1.27vcore & 1.33 QPI (now to see if its stable is a whole different thing). Looks like it is much more dependent on bumping the QPI up rather than the Vcore. Seems to not want to boot at all around 220x18.