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Now comes the hard part: How to make two tight-fitting, effective waterblocks for my two CPU's -
At first I thought of using a small aluminum canister used for lip gloss, drill two holes into it, seal it somehow and strap it to my CPU. Big mistake. By all rights my computer should have died about 20 times, but luckily the PIII has an automatic shutdown feature when it overheats.
I learned the hard way that cooling a CPU. requires a flat, hard and relatively massive surface that can mate properly with the CPU die. What to do?
After thinking about it for a week or so, I was looking at the two CPU's on my table and then it hit me - why not use the stock heatsinks already sitting on the CPU's and turn them into waterblocks? That could be a fine idea but I didn't know how on earth I could seal the heatsinks, in addition to permanently attaching copper barbs for the hoses..
The answer: Epoxy putty!
Propoxy 20 - Steel hard epoxy putty attaches to metals and cures within 20 minutes.
I came across this little gem strolling idly in a hardware store. You cut off a piece, knead it, apply it, and when dry, it withstands up to 18,000 PSI and 200°C. Cost: $6.50 a pop (enough to make all the waterblocks you would ever need).
I then took a thin metal container used for chocolate powder and proceeded to cut it into small strips I could cover the top part of the heatsinks with. I bent the strips so that they would fit snugly between the outermost heatsink fins, measured where I wanted my inlet and outlet holes to be, drilled the two holes, refitted the strips, and then applied a thick layer of epoxy putty to the joints, effectively sealing the heatsink (NOTE: even if you don't do it properly on the first try, you can always apply additional layers of putty, sealing any dormant leaks/holes.)
My two waterblocks: the one on the bottom is more effective since the center of the heatsink contains a "thin pin design" like the Swiftech and I could "latch" the copper tube directly between the pins. The top one has fins running from left to right so I just put a tube on each end.
I slipped two short pieces of copper tubing into the holes and permanently sealed them into place with my magic putty.
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