ouch.. I would avoid those..
unless, the 85w is for a gpu. Otherwise its underpowered, and you won.t be able to do what you want with it.
The 50X50 are quite large, and although they can "fit" under your block, you won't have any room to put the screws in for clamping pressure. No clamping pressure, the thing will suck eggs. You will only get 50-70% MAYBE of the efficiency of the pelt. Don't expect for the clamping pressure of the block to the CPU to be sufficient. I suggest buying a TEC block and a real 40X40 good pelt. Over time you will save money, because you won't have all the small pelts eating your budget.
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