There are 3 120mm sized Black Ice radiators:
Black Ice (prime): 4 pass, 3/8" OD barbs, tested by BillA; VERY restrictive
Black Ice Pro: 2 pass, 1/2" OD barbs, one row of parallel tubes for water flow
Black Ice Extreme: 2 pass, 1/2" OD barbs, 2 rows of tubes.
As far as fin density I've never held them up side by side but I am guessing they are probably the same.
Bob's comments dont seem unreasonable to me; for quiet wcing with low CFM fans I would also use a Black Ice Pro or better yet a Pro2 and not their Xtreme brethren.
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