Well you wouldn't use tap water. :huh:

I've completely submerged electric motors (while running) in non-conductive fluid to clean em.

There are plenty of non-conductive liquid coolant options for PC's. Potential leakage wasn't even a factor in the decision for me...

glad that my opinion could be of use.:)

*scratches head*

Ummm...I mean, all this watercooling advice is great and all (I actually did an evaporative cooling tower myself, once), but...

...are we missing the forest for the trees, here?

You realize you could eBay both your 6800 Ultras, and with that money in addition to about the cost of a good watercooling system, you could pick up a GeForce 8800GTX. Just one.

That would:
A) Consume a LOT less power than 2x 6800 Ultras
B) Run a LOT cooler
C) Run a LOT quieter (very significant improvements in fan design between generations)
D) Perform much, much faster. About twice as fast, actually, as the 6800 Ultras when SLI is working. Only there is no need to SLI, it will work just fine at that speed with the one card.

Alright... so this is what I did this weekend.

First, I picked up a larger power supply (670W vs. the old 500W). I can use the old 500W supply for another one of the PCs I'm eventually going to have to put together for the kids anyway so in the end I'm not really out a whole lotta cash for the extra power.

Secondly, I bought and installed 2 120mm fans at $20 each. I also added a little exhaust fan that I happened to have layin round.

A few months from now, when I start putting together the new PC(s) for the kids, I'll probably use one or both of the 6800s in the kids PC's and I'll just go ahead and pick up a new 8800 (or whatever) at that time.

So... I bought a new power supply $130, and $40 for the fans so my investment this weekend was about $170 and I've got some spare parts layin round now for when I put together the kids PC.

This pretty much solved all my SH3 GWX PC-related issues. ...it also made SH4 run a lot more stable... dare I say it's even almost playable?