Well I'll tell you what I happen to have one that I had sititng arround forever and funnaly put it together in my rig to test it. It gives the same temps in my system as one of the big rads 9x6 1/8x2. I am using a fan that does 200cfm though.
Anyway here are the temps I was getting with it. I have temps listed for my waterblock and for my maze2.
http://community.webshots.com/album/38150901opPARw