Simple way to cool with dry ice... this isnt as effective as it could be but it wont die when you run out of ice
Take a styro cooler. drill two holes- one at top left, one at bottom right. Run some kind of ducting from bottom hole into computer, so it blows into the CPU fan. Add a fan to the cooler to move air through. This will take the cool CO2 and put it right on the heatsink. Cool gas = more temperature differential between HS and gas, = more heat removed.
Alternatively, you could take cylinders of dry ice or any long solid pieces. Create a large tube directly over your CPU HS. (no fan). The sticks will touch the HS and absorb the heat, as they boil off the sticks in the tube will move down. This way you have ice touching your HS at all times (until you run out... be careful!)
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