I'm at 267*9 with a 3000+ for 2.4 with 1.3V, but I can go to 315*9 for 2.835 with 1.55V. I'm scared to go higher, because I fried my 3200+ with volts (I had this weird bug where it would go to 1.75V if I went into standby. I thought it was being misread by CPU-Z, but it wasn't I guess). This clocks better than the 3200+ (2.76 with rational vDimm), and I got my money back, so why complain?
I voted 2.4-2.59, as I run it undervolted at 2.4 most of the time.