Still have Xserver freezes about every 2 days.
I browse a lot, but think this occurs mostly when I'm browsing the internet and while loading or scrolling my Xserver just freezes. I can only move my mousepointer. Ohh, I'm using Mandrake 9.1 with 2.4.21-kernel. I compiled the nvidia-drivers against the kernel-sources. ( I esperience teh lockups in different window-managers if that gives some extra info)
No solution for you but I have a similar problem with Mandrake 9.2 on nForce using either the "commercial" precompiled Mandrake RPMs or the ones from the NVidia site. It locks up any time but particularly while graphics are busy (e.g. 3D screensavers) and sometimes locks up so badly that even the ATX "off" button doesn't work.