I bought one of the 3Racing fans and agree - its weak and seems to flow little air. The fans I've been using are from MegaMotorUSA. The 5v fan is 8cfm rated and it will deliver. They have 12v fans as well.

http://www.megamotorusa.com/


Fans are hard to find on their site - go to shop, then look for the alphabet below the image - click "F", fans start 3rd on this list.

I've not had a prob running 2 of these off y conn. I don't know what current they pull but the Quark125b and MM BECs haven't had probs.