ok, so you have one pump pumping through the blocks to the res, another through the rad to the res?
not optimal- the water must mix and all, and you're better of putting everything in series
having an intake at the back may not be the best idea, at least by personal preference since I prefer to control ventilation and seperate in and outtakes as much as possible, so as to prevent 'mixing'
your rad has the fan blowing at it- meaning the dead spot ought to be larger than if the axial fan sucked through it- I recommend you change this
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