I have some information that I think some of you will enjoy:
I had an Obsidian. I liked what it had to offer but I have somewhat high ambients even in the winter and I read everywhere (even OCN) about how the air-cooling performance was lackluster. I sold mine to another member and went over the ATCS 840 which has a lot of the same features but supposedly better air-cooling capabilities.
The Obsidian was configured as follows:
Rear Fan: stock but flipped to intake
Lower Fan: stock
Roof Fans: x3 Sycthe SlipStream 1200RPM
CPU Fan: Generic 2000RPM/88CFM
The 840 is configured:
Rear Fan: Generic 2000RPM/88CFM
Roof Fans: x2 Scythe Ultra Kaze 2000RPM
CPU Fan: Scythe Ultra Kaze 2000RPM
Front Fan: Stock 230mm
HDD Cage Fans: x2 Scythe SlipStream 1200RPM
Prime95 Small FFT Sustained Load Temps (hottest core):
ATCS 840: 73*C
GPU idles and loads are approx 5*C warmer as well in the 840. This is with the fan resting at its 40% idle.
So there you have it. The ATCS even with a considerable amount of additional fan power is beaten by the Corsair in an air-cooling only test. And before anyone calls BS/fanboy on me please glance down at the current specs for my sig rig.
EDIT: For those wondering why I didn't do the same rear intake setup on the 840 to better level the playing field, I did. The temperatures were best when configured as I listed above. While you can technically shoehorn a 38mm fan between the Mega and the rear case fan, it seems that it would be less than ideal.Edited by MNiceGuy - 12/8/09 at 9:37am