I have the same card and I can tell you that the nouveau driver is
broken with it. See the bug mentioned above:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=640464
According to point 6 of http://nouveau.freedesktop.org/wiki/TroubleShooting
do you tried building nouveau from the latest sources?
Maybe this is a idea or secondly request bug report directly to
freedesktop.
Yesterday for example I tried and filled a bug report:
https://bugs.freedesktop.org/show_bug.cgi?id=57081
Regards,
KarolSzk.
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