I'm probably not the most experienced user to tell you about comparisons, since I've only BEEN a Mac user for four months and this is my second Macintosh, but lets see. Compared to the TiBook 800, the fans are probably three times as loud, and turn on more often, however due to this the keyboard and under-case are much cooler. The top most function keys would become uncomfortably hot on the 800 during a 3D game, since thats where the graphics chip is. But the fans are a clean noise, theres no chopping or wavering or tics in the noise. Although Apple does not officially support DVD-RW, the Superdrive in the desktops can utilize the discs with programs like Toast Titanium or Discribe. The actual Matshita specs on the model number drive (UJ-815) do say it burns DVD-RW at 1x. I only have one DVD-RW to test so It's possible my Verbatim brand disc is incompatible. As far as DVD-R speed and compatibility go, I don't know

I hadn't wanted to use my only Apple DVD-R that came with it for just testing purposes, hence the purchase of the DVD-RW disc. And Like I said in my first post, the video performance is, to me, tenfold. The two 3D games I play primarily are Jedi Knight 2 and Soldier of Fortune 2, along with a little Medal of Honor: Allied Assault. They all pretty much use the same modified Quake3 engine, and perform similarily under the same settings. With the ATI 7500 (32MB) in the TiBook 800, I ran the games at 640x480 with Geometric Detail set Medium and Texture Detail set Low. In these games, Texture Detail is the great limiter. With the ATI 9000 (64MB) in the TiBook 1gHz, I choose to play at 800x600 with Geometric detail set High, and all OTHER supporting options turned on or set to their highest, though Texture Detail set to high will yield an unplayable frame-rate in very wide open areas. Moving through a narrow corridor though would show you a stunningly high FPS even at full quality. For general use in these games, Texture Quality would be set to Medium. The last thing I noticed is the screen appears to be much brighter, next to the 800. Seems the bulb for the display is a much more intense white. To summarize, there is louder, more often fan noise, there is increase in application performance, but a much more noticible increase in video performance(especially Quartz screen effects), and there may be zero support for DVD-RW, even though the drive's spec supports them.
Nosh