Mac OS X v10.5 Leopard requires:
A Mac computer with an Intel, PowerPC G5, or Power PC G4
(867 MHz or faster) processor
512 MB memory or more
A DVD drive for installation
9 GB of available disk space or more
Some features require a compatible Internet service provider,
fees may apply.
Some features require Apple's MobileMe service; fees apply.
Computers with processor upgrade cards are not supported with Mac OS X.
Although Mac OS X may install and appear to work normally on
some computers with third-
Apple does not provide technical support or assistance for Mac OS X
when used in this way. Contact the manufacturer of your microprocessor
upgrade card for support information.
Check out the Mac OS X Leopard Technical Specs
for additional details.
You should also read the Before You Install document included
on your Mac OS X installation disc.