Is this error software or hardware? What does it mean?

Hi, I keep getting this error in the Console - Just before the onscreen video glitches & flashes force me to shutdown my 24" (2008) iMac.
"PM kernel: NVDA(OpenGL): Channel exception! exception type = 0x8 = Fifo: Watchdog Timeout Error"
My hardware checks out... Started from scratch with software (that has run for almost a full year on my system)...
Everything looks fine, yet this problem persists. It sporadically pops up when running [only] Safari, dragging images in the Finder, [only] a game, [only] Pages, etc... I can't always reproduce the problem consistently and it doesn't appear to be confined to a particular piece of software, so...
Can someone explain just what this error means - to help me troubleshoot my issue better?
Thank you for any help!

The message in the log is the last thing recorded before my system experiences screen flickering, system lockup, and then a screen full of a random color such as a dark red, dark yellow, grey, or black. I can see that the screen is still on and back lit, but I have to force quit the computer and restart it.
I have not been able to reproduce the problem to a specific piece of software as it has occurred while running Safari, Pages, Starcraft 2, heck even just moving documents around in the Finder. The problem started at the end of March.
Apple Hardware, Disk Utilities, and TechTool Pro 6 says, for the most part, that everything is just fine. TTP6 did highlight 3 issues with the SMART parameters for my hard drive - 2 of which ("Seek Error Rate" & "Hardware ECC Recovered") still passed the test. The one hard drive issue that failed the test was the "Temperature Changes".
For absolute completeness sake, after exhausting my bag of troubleshooting tricks, I started from scratch. (Something I haven't had to do since the days of OS 9.)
I have since :
Thoroughly wiped my drive.
Reformatted my drive.
Reinstalled Lion (which I've used since its release without problem).
Used TTP6 to Defrag & rebuild directories.
All software is up to date.
The only additional software I've reinstalled, for graphical stress testing is SC 2.
The system still randomly suffers screen flickers, followed by system lockup, and then the screen displays a solid color = force system reboot.
My fixation on the graphic hardware is because the most reoccurring log reports from the Console notify of a GPU restart and the "NVIDIA" channel report. Oh, a few days ago I did get a kernal panic on :
"(cpu"

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Message was edited by:
user508054
Message was edited by:
user508054

Is this error software or hardware? What does it mean?

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