One of my cases (Antec P180) has decent ventilation, but my fan installation and speed choices were designed when I ran a dual 8800GTS G92 system on water. And that system has a 6950 1GB on air - thing is, the 1GB card has a crap heatpipe cooler that barely copes (the 2GB model has a way better reference cooler). With the case side off, it'll bluescreen after 3-4 days of hashing...thinking it eventually gets over the heatpipe's ability to remove heat; I am assuming it's thermal runaway. Solution was to order an Accelero Xtreme Plus cooler...it'll also solve the noise issue (this is my in-bedroom computer and is currently pretty loud...) - it's in the mail now.