problem is that the gpu blocks restricitiness can not be easily analytically quantified. I attempted using pipe pressure drop equations (darcy with rectangular to cylinderical diameter correction, calculated re=2800 @ 1 lpm so used colebrook for a punt) but the bends in the block proved to be where the restrictivness came from. All gpu blocks are going to be like this as they are maze style and nobody has done any testing on them.
Rather than test doing seris with a big ass pump to remove any vagueness is a sensible approach that can't fail to produce satisfactory results.
Git (if i may call you that) have you considered that a) the block approximation you are using is wholy inaccurate and your calculator does not include bends in pipes which have a k factor of 0.19 per bend. Also all these tube connectors are bound to cause some kind of pressure drop.
Besides your approximator is approximate anyway and you can always blame crap mobo temprature sensors.
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