I am having the same lockups. My hardware: Asus M2N4-SLI , Athlon X2 5000, 4 GB ram, Nvidia 7300. I am running x86_64.
Sometimes the system pauses momentarily. Sometimes the GUI locks up. When it locks up, sometimes I can SSH in and reboot, sometimes I can't. The lockups seem to be worse in gnome than in XFCE4. I also tried KDE and got lockups. In both KDE and gnome I had desktop effects turned off. I also have added the nomodeset kernel option. nomodeset seems to make the crashes less frequent, but they still happen. One other thing I have noticed is that I sometimes have a partially garbled display in Firefox. It happens during scrolling.
This exact hardware was solid in F6 and F8, both i386.


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