BlackHoleSun

As it does act as an impeller the differences from the fans are as thus:

Standard "blower" is a centrifugal design a believe whereas the Co-Op fan is axial flow. From what I can remember about compressor designs (mind you I'm an ECE major not an ME, lol) a centrifugal design is a dynamic compressor compared to the axial flow compressor design used on the latter. The centrifugal design will push more air out exponentially as the speed increases. The axial flow unit is more linear in its delivery of air. From what I have seen, the centrifugal fans used on graphics cards are obviously small become noisy once they really start pushing out tons of air, which is sometimes at 5000 rpm. The axial flow type fan on the co-op is larger and requires less turning speed to put out substantial cfm. Also I am not sure if the bearing type between the two is different as that can cause noise differences as well.

To sum up, what I am getting at is maybe a larger fan that runs at a slower speed, but puts out higher cfm per rpm. Maybe scythe can just make 92mm Gentle Typhoons!

EDIT: Just checked, Scythe does make 92mm GT! I don't know if that is the size of the GPU fan though. Hmm, I'm feeling a sweet mod idea coming on here...

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Clockadile Dundee

That sounds right, the same could be said comparing turbos(an axial compressor I think) to centrifugal superchargers, anyway.

In other words, you happened to have incidentally described the characteristic behaviors of these two kind of compressors, as well, if that is reinforcement to your post.