Okay so after using it for a while I decided to change some things due to some issues I was having.
I was running an Opteron 165, DFI Lanparty NF4-UltraD, and 7900GS on 10.5.4 with the 9.4.0 modbin kernel. All of my hardware worked pretty much. I had the following issues:
1. Random app crashes. Transmission, adium, and my web browsers (firefox, camino, and safari) would crash every 3 hours or so. I managed to get decent stability out of firefox by running it through rosetta, but still.
2. Weird sound issues. I know my onboard sound is hardly supported, but I used the ALC850 drivers and got sound. However, the sound would come out of random connectors on the back. Sometimes I'd get sound out of the front channel analog out, sometimes it'd come out of the rear channel...
3. Mouse jumps. The mouse works beautifully for about 2 hours. Then it starts jumping around all funny. It happens every time. I've tried other mouse drivers and no dice. A reboot fixes the issue.
4. I hosed it. I'm doing some iPhone development and had the sdk for iPhone OS 2.0. I upgraded to the newest sdk and I guess it installs something that kills the hackintosh. It made it almost all the way through the install, then it froze. I could not get back into the OS. I'm having trouble re-installing the OS from the same DVD so I'm just gonna give up on this hardware.
I'm not too sad as having a system I had to reboot every 2 hours to have work properly wasn't much fun anyways.
So I went out and got a Q6600, 2x2 GB DDR2 and a Gigabyte EP45-DS3L. I'll report on my success with this hardware as soon as I can get the system to POST
update 100% working now