The Mac specs can be found at Aspyr, who are responsible for the Mac ports.OriginalUniversityNightlifeOpen for BusinessPets
I've attempted to round up a summary of Macs that meet these specs. However, as always, your Mac might not exactly fall within these and it's probably not complete, but covers most recent Macs. Consider it a guideline, I didn't even attempt to consider built-to-order specs or third paty upgrades.
Also note, Aspyr states you need a DVD drive. Macs, of course, do it slightly differently to PCs and its not just called a DVD-ROM drive: a ComboDrive reads DVDs and burns CDs, a SuperDrive burns DVDs as well. So you need a ComboDrive.
I'm pretty sure all these models shipped with at least a ComboDrive, Apple have been shipping them for years, but you'll want to check. I'm also fairly confident they shipped with at least 256mb of RAM as well, but again, please check.
To find out the processor speed and amount of RAM your Mac has, go to the Apple Menu > About This Mac.Desktops
iMac G4: later models with the 1.25ghz processor
iMac G5: all of them
iMac Intel Core Duo / Core 2 Duo: all of them except for the cheap 17" with the Intel GMA950 integrated graphics
Mac mini G4: all of them
Mac mini Intel: all have the Intel GMA950 integrated graphics, doesn't meet specs
PowerMac G4: Later models with the 1.25ghz processor
PowerMac G5: all of them
Mac Pro: all of themLaptops
iBook: none of them
PowerBook: later PowerBook G4 series (the aluminum ones, not the titanium with the black keyboards).
MacBook: none (has the Intel GMA950)
MacBook Pro: all of themAbout that Intel GMA950:
This is not recommended by Aspyr and doesn't meet the specs. Then again, people have been known to run Half-Life 2 on them. I don't have any experience with these and the Sims 2, but I do know you can get HL2 to run on them with no less than 2GB of RAM and it's playable. Anyone running TS2 on one of these?