Awesome. I have an older HAFX case, and while the fans it comes with are nice, they aren't meant to cool 100% stressed GPU's. For the time I've just been pointing another fan at it hoping to cram as much air in there as I can... which has only resulted in a drop of 1-2 degrees. I'm very interested in how this goes.
My concern is to keep the machines at a steady temp as opposed to having them really cool. 70 - 75 degrees celcius should be good enough.
These delta fans I'm using are designed to run 24/7 aswell.
My setup is heading towards fully professional and I am considering other ways I can use my "datacenter" to make money.
Air conditioned room w/ brand new conditioner.
Room is using 7kWh in power with room for expansion.
Dust free enviroment.
Reliable network connectivity with failover.
Real time performance can be monitored remotely
42U rack housing console monitor w/ keyboard mouse.
KVM installed in rack, patch panelled network ports with 19" switch.
Plus other stuff to come.