I have the same issue with a different configuration.
Asus A7N8X-X with Asus V9950(5900) Geforce FX. The motherboard also has an nforce 2 chipset. Running Suse 9.1 with kernel 2.6.8. It does load up X fine since I removed AGPGART and the Riva Framebuffer Module from the kernel, but in 3D it freezes after about 30 minutes. It's a hard kernel lock where everything goes dark. No network, no keyboard, no ctrl-alt-F1.. nothing. If I wasn't running reiserfs, I'd be totally screwed.
I don't know what's going on, but the 6106 drivers- which is the same as 6111 when you extract it, are just smoking my system left and right. i really don't know what to do any more. I've tried all the tricks, and nothing is working. It just doesn't like the kernel.