Thanks BladeRunner for pointing some things, I totaly forgot to think about.I also read your thread on bbs. I went to friend of mine who know more of this stuff, and we open one PSU and took a look. You've got two heat sinks, one on high voltage AC part of the PSU and one on the low voltage DC part. If you saw the transistors on AC sink are all isolated with silicon, and the sink isn't live. And on DC side, two of the transistors are conncted to the sink and it act like a mass for them. So I would isolate all transistors on DC side and the reconnect two transistors with piece of wire and solder. Now the problem would be if we connect both sinks with water in the block, because if some sort of electrical surge would pass isolation we get 240V to DC part and then to whole computer.So some sort of insulator should be used, like you said ceramics, glass, I looked at thermal conduction coeficients and find that marble has 2.8W/m*K, it shouldn't be to difficult to find nice flat piece ,ceramics may be better, I couldn't find thermal characteristic for them , and I don't know where to search for flat piece of one. And for even better safety I'd use Alu. for water block and then annodize it for isolation , then ground all the blocks and water in my computer, and the last thing, I'd use surge suppression .
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