Dont think anyones mentioned whats really important considering his question.
If you want to use slow fans a thinner rad is the way to go. They are both 2" thick.
As far as a double pass increasing the velocity of the water though the tubes? Im not really sure about that.
Yeah with the double pass the water is going through the same surface area and the water going through each tube will be faster but you are talking double the restriction of a single pass HC, maybe even more. I dont have any #s to back any of this up but I'd guess the flow rate loss would negate and gains you get from higher velocity in the tubs of the HC :shrug:
Course then again with a 6002 even if his flow rate goes from 0.75gpm to 1.5gpm from a double pass HC to a single pass HC its like 0.5c of a difference. So I dunno.
Regardless, one of those black ice pro double 120mm radiators would perform better than any HC due to their thinness when you use slow fans...
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