Degrees C or F? If F, then they aren't that bad. If C, then....
As far as hookup... I side with hook the output of the radiator to the CPU block. That way the coolest water enters the CPU block. Also, all heat adding components (blocks and pump) are before the rad, meaning water entering the rad will be at its highest. In both cases this gives the largest DeltaT, meaning better cooling (basic thermodynamics, the larger the DeltaT the greater the heat flow, coolest water going into CPU block, hottest water going into the rad).
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