It is a little cramped, but I stuck a 6800GS, 3 HDD's (PATA, none of that hardcore SATA bs with the tiny wires;) ), a DVD-RW, then a Nexus Fanbus controlling an ungodly huge Thermalright AX-7 heatsink with a Vantech Tornado on top of my Barton 2800+.
It fits, and yes it's a bit cramped, but the airflow is still superb..... well designed unit that keeps the peices and their cables out of the way of the airflow.
I am, howevor, officially sick of computers as of right now
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Installed all my old stuff into my new case, with 2 gigs of new RAM, a new sound card, and plugged everything in, and my BIOS was reading 4.5V on my 5V rail, and 11.5V on my 12V rail. Take into consideration this is a 530W Antec TrueControl. It's a powerful PSU. Was getting artifacts and locking up... I thought the RAM was bad, but it turns out the control unit for the PSU came lose during installation which knocked all the V's back to default which wasn't enough juice for the unit. Combine that with Windows needing to be reactivated, a LAN card that mysteriously "lost" it's driver, and a graphics card that's settings got fubared(because I originally thought the artifacts might be from a damaged pipe or shader that I had unlocked, so I locked them back up, then the drivers starting going haywire cus windows didn't recognize it anymore)... AHHH what a mess....
Finally got that all fixed to find out I installed the headphone and mic jack wrong for my front panel, so I have to dig in there again and fix that. Fun times..... kill me now..