ok, heres the reason, you have the water input in the center, right in the center above the core the fins are cooler untill the heat spreads ******d a little more, the water picks up more heat and pushes it around, by the time it hits the outside its actually warming up the waterblock at that point its all warm, If the waterblock was different, like a ww with only 2 barbs, the outlet side might be a tad warmer to begin with.
Jon
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