Aperture Checker determines whether or not your computer has the necessary horsepower, RAM, and graphics ability to run Aperture.
On my 867MHz Quicksilver, it said:
Aperture cannot be installed on this computer.
- Aperture requires at least a 1.8 GHz Power Mac G5, a 1.8 GHz iMac G5, or a 1.25 GHz PowerBook G4.
- Your graphics card does not meet the minimum requirement for Aperture.
It’s too bad there are stiff system requirements. Since PowerBooks and iMacs have their graphics chip soldered onto the motherboard, they are out of luck unless they bought the most recent revisions. Many photographers like the 12-inch PowerBook since it’s more portable than its 15 and 17-inch siblings. Unfortunately, the NVIDIA GeForce FX Go5200 chip it uses isn’t on Aperture’s list of supported video cards.
tow.com 
Yay! cannot believe old 1.33ghz powerbook 17″ will work with Aperture!!