QFT... if this product just somewhat works, just watch everyone catch on and it'll be the new big marketing thing since heatpipes(but those actually work well).
IMO, they'd be better off making that water core into copper with fins drawing out from it and then a fan cooling it. It seems like it would be such a small amount of water just sitting there and stirring up(not sure how good of a job it would do conducting and dissipating the heat in such a small closed chamber right above the cpu...seems stagnant to me compared to a conventional water block cooling set up, water has a lot of circulation to cool off before coming in contact with the heatsinks again).
In assumption that this does actually work well, then we'd have to assume that the water draws the heat very well from the initial heat sinks in the chamber, then it can actually draw/channel that heat to the copper/carbon fins fast and effectively enough to cool(if the water can be cooled fast enough) the cpu.... if it doesn't work, like I said, I can just picture hot water(because it's not getting cooled down fast enough) just stirring around in there.
But who knows, maybe it is just enough to keep ambient temps stable?
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