Thanks Raiderman, actually I don't have Auto Express enabled. It sets it at 124 and I did have some trouble with it in the past. It does seem to improve video performance to some extent so I manually set it to 117 and haven't had any problems with it since (with a slight bump on HT v's) ...

After alot of tweaking I actually did get things up to 19x207 (3933 core) and was pretty close to having it Wprime/IBT stable. That was at 1.575 Vcore and 1.35 Vimc.
Then I smelled something burning...

Scared the crap out me! Turns out the ceiling fan on my Antec 900 case died, so I just went back to my known good settings....

I'm sure there is more in this 940, and the fan dying had nothing to do with my OC, but I'm kinda buzzed so I'm done for the night...

I'd still like to know if anyone has a fix for the Sparkle and audio corrution though...