Yeah. Serious air. The fan on top was actually an 84cfm Sunon.
I kept the front panel shut unless I was benchmarking. Temps on the CPU would drop ~5C w/ the extra airflow. At 1.5v on my X2 4400+ @ 2.7ghz I was loading at 56-58C in dual-prime.
The downside was the noise. When I opened the front panel it sounded like a quiet