I also am on a qx 9650, on the first official with penryn support. 11-07 and so far all seems well, I do get the 88 code (but it does recover )if I try to set 11 multi though but 10 seems fine for now, just happy to have it running.
my x-38 didn't recover from 88 codes without a cpu swap .(and i use phase cooling, so that is a pain). after catching up in this thread I tried my p-35 and so far so good.