"It's a Senfu!"
(Water
cooling a Celeron, and why you should care)
I grabbed some readings from System Health Monitor: 18ºc. I wouldn't trust this at all, because I was once told my cpu was at 27ºc just after I burned my fingers on it. Then I got down to some benchmarking.
The temp at 550 hangs around 20ºc most of the time, but that's according to System Health monitor. Memory benchmarks at 550 don't properly reflect the speed increase, because for some reason the system won't get through the POST screens at CAS2.