Maybe What I need to be sure is another mobo, its very dificult for me to get consistent results. If I intentionaly tweak aiflow arround socket, reported temps can vary as much as 8ยบ.
End of Rant.
Flow wise, this block should be less restrictive than white water. Channel cross section area is about the same. Mine is 16 channels of 4 x 1.2mm, WW is 16 ch. of 5 x 1mm. The difference is in the nozzle. Mine is a 6.5mm diameter circle, equal to 33mm2. WW has 8 slits of about 1 x 3mm for a total of 24mm2.
So this case could be similar to what Volenti proved with his direct die: Several small jets are better than a bigger one.