I didn't mean to cheat, sorry for some reason in the English version there was not the pic, anyway in the pic you don't see very well the holes covered.
I did some testing using the waterblock with transparent walls and the flow was clearly turbulent (though when testing it did'nt share the pump with the PSU and GPU). The flow doesn't need to be laminar just because the walls are flat, it depends on the Reynolds number which in turn depends on the fluid density, pipe diameter and the fluid velocity. I didn't bother to calculate it for this case because I "saw" the flow was turbulent.
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