Easy to achieve 1.4-1.5gpm using a G5/G4 with a slightly strong 12v rail (~12.5v) from the PSU using one of a number of 12V DC pumps in a full-system. Pressure-drop differences are not huge in comparison to some other blocks, but certainly significant, and tell a different story to what a straight look at a flow vs C/W chart will give.
http://www.procooling.com/reviews/as...cpu-air_sm.jpg
I do, however, not consider the Storm design to be a pin nor a fin block block, and certainly not in the
channelled sense as typically applies to every other example of a pin/fin block.
The Storm design actually has less wall mass and surface area than a pin block of similar size given a certain CPU heat source.
IMO, the Storm design is not something which should be used as an argument for pin vs fin. It is a poor example of either.