M-0 is not that great, they like voltage, but thats it.
My E4500ES did 2800MHz dual 32M with stock volts. 3250MHz with 1.45V. 3325MHz with 1.5V and 3700 1M with 1.7V set in bios. Not that bad, but not any better than L-2 Allendales.

Great clocks on the E6550 irev210! I did not know they were that great clockers. Otherwise I would have tried to get one :/