I'm buying the supplies I need to clamshell my MacBook (bluetooth keyboard/mouse/neat monitor stand) for the next year while I take time off from college. As for the display I want to go with a 22" or 24" DVI display, but I want to know: If I go with a 24" monitor with a display of 1920x1200, the MacBook's maximum supported resolution, am I putting such an excessive amount of overhead on the hardware that my fan will be whirring on high far more often? I feel like that would jack up the horsepower needed to do anything full screen, be it a screensaver or a full-screened video. Or is that factor (the resolution) of the problem not really so important? edit: Previously, I had my MacBook extending its display to a 720p LCD without observing an increase in heat production - so I calculated the pixels my MacBook was powering in that arrangement (1366x768 + 1280x800) versus a sole 24" display (1920x1200) and arrived at this difference: 2073088px for TV+MacBook's LCD 2304000px for one 24" LCD Is this even a rational way to address the question?