Quote:
Originally posted by bigben2k
Ok, so basically your experiment showed that you got 2 deg C improvement, by actively turbulating the water over the coldplate.
Interesting indeed!
You're getting very low water temps, but there's a 12 to 18 deg diff between the water and the CPU, and that's an indication that there's a problem with your baseplate. I'd guess that it's too thin, but like you said, it was just an experiment, to test a theory.
Would you consider doing this again and reducing the gap between the impeler and baseplate even further, down from 1.5 mm? Alternatively, you could add brushed to the impeler arms.
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The water temps are simply a result of the ambient temps I have here, nothing special about that, my best blocks get about 10-13 degrees above water temps (idle-load) that's a fairly typical delta with the other water cooled P4's that I've seen.
it wouldn't help any even if the BP was thicker since the only copper that comes in contact with the water is directly above the heat spreader, more or less, that's the main reason why i used a very thin BP.
The 1.5mm gap was an estimate since the impeller can move slightly up or down (it's held in place by the magnetic field ) the pump makes a sound similar to what I'd expect if the impeller was touching the BP slightly (slightly scratchy/rattly sound) that isn't very surprising given the suction the impeller creates would tend to try and pull the impeller closer to the BP.
I'm not sure what I'll do with version 2 yet, may try to modify/make an impeller to do more mixing over a larger area and use a booster pump to assist flow rate. will have to sleep on it.