When I got my new video card I installed the omega 4.6 drivers. My chipset drivers were the 3.13 ones. I was seeing checkerboard artifacts over shadows in RavenShield. I was afraid it was my card but then I uninstalled my display drivers as well as the chipset drivers and cleaned the rest using Driver Cleaner. Then I installed the latest nforce drivers (4.24) and the omega 4.5 drivers and the problem is gone. I'm not sure if I had done something wrong when I first uninstalled my 9200 (I didn't do anything other than what I normally do) or if there's a compatibility problem with these drivers and older nforce drivers (I wasn't getting these issues in ut2k4) but all I know is I had problems before and now they're gone. Just wanted to point that out in case someone is ever faced with a similar issue. Like I said, I do not know what exactly was causing this but the nforce 4.24 / omega 4.5 combination works like a charm.