I researched this PSU water-cooling for almost 6 months before doing it and so far it's working superbly & safe. The Block has all the mosfets mounted to it and is all copper soldered construction air pressure tested to 5 bar, (70 PSI). Push fittings were exited out the side so no pipes would go inside the PSU incase of drips. To me the PSU fan(s) even at 5v were intrusive and the project is about total Performace PC silence. HDD's are 2x new Seagate barracuda IV's with fluid drive motor and ARE virtually silent. My cooling system also has no fans or rads, Zero fans means
Zero fans and with my open PC about three feet away in a silent room with no background sounds the only thing I can hear if I really listen is the very very faint buzz of my cathode ray tube.
System
Athlon XP1600 @ XP1800
MSI K7N 420 Pro (nforce)
256mb 2100 DDR
Asus V8200 GF3
Seagate Barracuda IV HDD's (2x)
SoundBlaster live
Enermax 550watt