I upgraded from this homebrew block: (the one on the right)
to the Whitewater (polytop). My pump is an eheim 1048 and I use a Geo Tracker heater core and rheovolted 120 mm Panaflo L1a.
At the speeds/Vcore listed in my sig, my load (cpuburn) temps dropped from 63C to 59C. Ambient is 27C. Running the fan at full 12V drops it 2C.
Temps are a bit lower Folding: 52C.
BTW, those temps seem high across the board. I don't think my diode reads correctly.