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35a32c5
(Get the code!)
I just ran xorg-edgers' ppa-purge and tried the card again. I have enabled compositing in Metacity. One test was selecting the Applications menu and rapidly switching through that and Places and System, which eventually froze X. After doing Alt-SysRq-K, it allowed me to log back in, and I tried again with no problem; I opened some semi-transparent terminals, enlarged them, and moved them around over eachother. Trying to enlarge the ~eighth terminal froze X. Eventually I had a kernel panic. Occasionally I can't even boot fully. Sometimes X will freeze and allow cursor movement, other times won't. Has occured a couple times in a (Ctrl-Alt-F1...) virtual terminal.
Often I see colorful flashing as textures load, particularly at boot. Once I rebooted and seen the screen as it was when X froze, for a few seconds, and it cleared and finished loading GNOME.
I suppose there is a chance the card is defective...but it has no problem with the NVIDIA binary drivers. (As an aside, I even had Compiz running in Nouveau for some durations before freezing.)
I may try booting an Live session soon to see if it happens there too.