We been over this a few times already. The problem is the heat spreader needs a LOT of pressure to make good contact with he CPU Die. The spreader is kind of "floating" on it when a HS/WB is not installed and making poor contact. If you can find a way to put a lot of pressure in the middle of the heat spreader and still come up with a jet impingment style setup then it might work ok. Especially on AMD FX's as there is some serious copper in that IHS.
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