Either you've got no flow (or low flow) or you've put too much thermal paste. Happened to me, using Arctic Silver. It's so thick it won't squeeze, but 'stay' over the core. I removed the DD block, cleaned the mess up, used a razor blade to apply the thinnest coat i could then refit the DD block. Result: a drop of about 10°C !
About water flow just use a free tube and a basin. Look at how far it can shoot this coolant. If all you got is a trickle that's it.
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