with higher CFM fan the Infinity will come out ahead (not by much though) due to tighter packed fins and thus more contact area with the forced airflow. you can see my more in-detail Infinity test here: http://www.madshrimps.be/?action=getarticle&articID=503
the UltraChill is same as MACS TEC COoling and Titan Amanda , while their performance is pretty good, I found them to be too noisy to even come close to the noise/performance balance of Scythe Ninja/Infinity and other large tower coolers