Alright, this will make AMDforMe shut up for good now. I asked Corsair how conductive the liquid in their closed loop coolers was. Here is their response:
It's conductive, BUT...
If it leaks it's not fire and destruction. There might be magic smoke at worst.
And it bears mentioning that we are the only vendor of liquid coolers that warrants the rest of your computer against leaks. So if he gets an H100i and against all odds it does leak and damage his system, we'll replace the damaged parts.
You can ask them yourself if you don't believe me.
AMD FX-8350 w/ Corsair H105, ASUS Sabertooth 990FX Gen3/R2, 8GiB G.SKILL DDR3-2133, XFX HD 7970, 512GB Vertex 4, 256GB Vector, 240GB Agility 3, Creative X-Fi Titanium w/ Creative Gigaworks S750, SeaSonic X750, Corsair C70, HP ZR2440w, Win 7 Ultimate x64