As Vapor pointed out, our original VID-AR587 didn't use microfins. The VID-AR587T2 (for later HD 5870's) does, though.
There are certainly other factors, like quality of contact, cold plate thickness, etc. But all things being equal, I will be surprised if the microfin coolers don't top out the list. ... And the Koolance 480 block uses microfins on both the GPU *and* VRM area.
Tim
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