Here is where I'm at thus far...

http://valid.x86-secret.com/show_oc.php?id=412137

Running MemTest on 1840 8-8-8-18 2T presently, we'll see how far CAS8 will take me. I should have quite the write-up on the G.Skill DDR3-1600 CL7-7-7-18 (F3-12800CL7D-4GBHZ) kit when all is said and done. CAS7 bottomed out at 1780.