I ave my i7-930, Ram , motherboard & video card (5770) all water cooled running through 2 140x3 rads, yate loom fans running at 1100 RPM
my CPU is overclocked to 4.3GHz, and when i run Linx 20 passes by the end i can feel the water is getting rather warm...
guessing 35-40 deg, no thermometer on it so i can't say.
I'm not worried about it because i normally don't run my machine that intensive...
just thought I'd give a heads up of my findings as unscientific as they are.