Yesterday I received my monthly mailing of the Apple Developer Connection CD and DVD I usually just look at it for a few min, browse through the files, etc. But I got the idea that I'm actually going to COMPILE some of the things on it. So I copy off all the 3D graphics sources, and start compiling them one at a time trying them out as I go playing with things that are neat. I get to this one really cool Carbon OpenGL testing app. I start selecting different shapes to render and i get to a cool one. I started playing with the help options, enabling FSAA 4x, 32 bit etc. then i found the button to increase the number of vertices. I start hitting it a bunch of times. It kept up over 500 FPS till about 75,000 vertices, then when i did another it slowed to about 250 FPS at 150,000. Ran fine. I hit it again and the computer stopped. I figure it is just thinking and working on how to display it. After a little while still nothing. So I shutdown the puter via the button the front. Turn it back on and verbose mode shows that there are some problems with the scsi card and its connectivity. repeat this booting process for a while with no changes. after about 4 repeats, it shows a new line in verbose boot. Thermo something. I got the idea that it was an over heating issue, so I open it up, reposition some of the cards etc, and wait. Boy it was held to wait. I boot up after it was cool and everything started working just fine. Immediately after it booted I launched a temp-monitor app and watched the temp climb. I did some research and found that Apple in the replacement program sent everyone a new power-supply and a main fan that was quieter that the one it shipped with. My research concluded that this replacement main fan could push 37 CFM at 45dB. Those of you into cooling know that ratio SUCKS. The original fan had these specs: 158 CFM at 52dB. Now you tell me which is better. Needless to say I almost INSTANTLY shutdown my computer and installed the old 31337 fan. Its about the same volume now, but if there is an emergency over heating issue the fan can kick up to "jet engine" mode to blow that hot air right out its a$$. It is nice now.