So I take it that the X1600 has a MTTF of 2 years? I've been having various problems playing games on my mac since I got it (c. August 2006). If I try to play for more than 30min or so the performance degrades noticeably; i.e. computer may freeze for a second or two, screen glitches (this is more recent), and the computer locking up completely which leads to a very rude power button cold reboot with nothing in Console to point to the problem. Recently I've been playing X-Plane 9 and that so far has been the worst. I tried today to replicate my issues and have included screen shots of the worst that I got. I don't know if it is related to this forum, but X-Plane frequently hiccups (i.e. locks computer for 1-15 seconds) after about 20-30min of playing. Heat issue? HDD too full and fragmented? ::shrug::
X-Plane gets random glitches that range from triangular shapes to black lines. These lines are usually vertical and can't remember if they've ever been horizontal - I usually try to ignore them and keep playing. I take good care of my "little" guy: forced daily/weekly/monthly scripts, repair permissions, clear caches and PRAM/PMU resets every now and then, Griffin Elevator, FanControl with strict settings, etc. However, since it's the only computer I have at school, it's always on.
I didn't get AppleCare and I've already voided my warranty by upgrading the HDD. I wanted to replace the HS paste with ArticSilver, but never got to it. Now I don't know if that would be a good idea in the event that Apple decides to "fix the glitch". Point being, my HS temps differ from core by ~60°F as seen in the screen shots. For reference, ambient temp is 75°F, clamshell is closed (though i still have issues when it's open), external LCD @ 1920x1200.
http://img66.imageshack.us/img66/6411/artifactscreenshot1.png
http://img201.imageshack.us/img201/1637/artifactscreenshot2.png
Feel free to ask for anymore info.