Antec Kuhler H20 620 GT1850

I don't know how quitet the typhoon fan is but I replaced the Antec fan with a pair of Cougar 120 fans and not only does the 620 run cooler but quieter too. To add a second fan in a push pull is easy: just get some long screws.

As to cooling between the typhoon and Antec fans I doubt that there will be much of a difference.

Although i highly advidse againt closed loop cooler i found the AP-15 not silent but quiet to my ears, plus they have like awsome static pressure since im pretter sure those closed loop habe high FPI, you should have gone the high end air cooler way IMO, unless space was the cause