Who says that deionized water doesn't carry a charge? Besides someone in this thread
? Check out Horiba's The Story of Conductivity
for a pretty good explanantion of water's electrical properties. They say the difference in conductivity between tap water and de-ionized water is about a factor of 100, with de-ionized water having a conductivity of less than 1.0 uS/cm, but necessarily more than 5.48x10^-2 uS/cm (the conductivity of distilled water). While this may seem like a poor conductor compared to copper's conductivity of 5.9x10^11 uS / cm (reference here
), it's got nothing on air at sea-level, which has a conductivity of 2.5x10^-10 uS / cm (reference here
). Forgive my cheesy references, but, alas, I have no CRC Handbook handy. If I did, I would also provide the conductivity of some type of oil for comparison, since I've heard stories of persons sucessfully submerging their computers in mineral oil (see here
Anyway, my point is that I don't think submerging your motherboard in any kind of water is a good idea. Even if you've "waterproofed" it, you're just asking for trouble. Mineral oil or HFE
is a lot less risky, although the latter is prohibitively expensive. And, as Ducky says, pretty much any of these submersion techniques will still require a pump to circulate the fluid, so the silence-value over traditional water cooling is nil.