EMC2: Thanks for all the information. It looks as though this project could turn out to be much larger than I had originally anticipated.
1) Good idea. I will see if I have any PVC pipe lying around (I'm sure I saw some somewhere...).
2) I don't think variations in thermal interface are a problem. I remount the waterblocks between each test, and I see very little change in the results. Also, a thermal pad has a relatively high thermal resistance (about 1.5C/W for one that size?) which would need to be measured and subtracted from what I measure.
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