Kernel panic occurs too often recently...

...during a very short span of time (three days). The very first one I got this fall when exporting 6 h iMovie project.

The next one as well as several ones later on were caused by Pages and Numbers while entering Browsing Versions mode. After peace and quite lasting several following weeks Pages crashed my system once again three days ago (manifesting itself under the same conditions, i.e., me entering Versions browsing) soon to be found in a nice company of two subsequent kernel panics caused by Aperture 3.4.5 within the last two days. In all cases I notice these lines of messages in all of these crash logs:

Kernel Extensions in backtrace
         com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f808bf000->0xffffff7f80bbafff
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff7f80849000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xffffff7f808ad000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0xffffff7f80874000
         com.apple.GeForce(7.3.2)[7E1D7726-416F-3716-ACCB-E1E276E35002]@0xffffff7f81e0a000->0xffffff7f81eccfff
            dependency: com.apple.NVDAResman(7.3.2)[97284661-2629-379E-B86B-D388618E8C30]@0xffffff7f808bf000
            dependency: com.apple.iokit.IONDRVSupport(2.3.4)[7C8672C4-8B0D-3CCF-A79A-23C62E90F895]@0xffffff7f808ad000
            dependency: com.apple.iokit.IOPCIFamily(2.7)[5C23D598-58B2-3204-BC03-BC3C0F00BD32]@0xffffff7f80849000
            dependency: com.apple.iokit.IOGraphicsFamily(2.3.4)[D0A1F6BD-E66E-3DD8-9913-A3AB8746F422]@0xffffff7f80874000


BSD process name corresponding to current thread: Aperture(Pages/iMovie)

I googled tones of internet staff coming across a vast number of alike issues over the last five-to ten years of Aperture's developing but nothing to actually answer mine except the likely candidate to the main culprit being faulted GPU. However running Apple Hardware Test (regardless of number of passes) ends up with the message "No troubles found".

What's it all about, could anybody enlighten me? Is it indicative of the screwed up GPU?

I.S.