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Mac OS X is the operating system used by G5 Macs. The latest version of Mac OS X that will work on a G5 is Mac OS X 10.5 (also known as Leopard).
After Mac OS X 10.4.11 (Tiger) you need to buy an upgrade to Mac OS X 10.5 (Leopard) the current highest version of which is 10.5.8. Leopard will be as high as a G5 can go as 10.6 (Snow leopard) requires a newer Mac with an Intel processor.
There was no Mac Pro G5. The Power Mac G5 was discontinued in 2006 and replaced by the Mac Pro with an Intel Xeon 5100 series "Woodcrest" processor.
As Sims 3 requires a Mac with an Intel processor it will not run on a Mac with a G5 processor.
The Power Mac G5 was released in June 2003 and discontinued in August 2006. The G5 referred to the PowerPC G5 CPU produced by IBM and used in this line of computers.
To upgrade beyond Mac OS X 10.4 (Tiger) you will need to purchase Mac OS X 10.5 (Leopard). If the iMac has an Intel processor you can jump straight to Mac OS X 10.6 (Snow Leopard) but if it has the older G4 or G5 processor then 10.5 will be as far as it can go.
Mac OS X 10.4 (Tiger) can be updated to Mac OS X 10.4.11 for free. Purchased upgrades then are Mac OS X 10.5 (Leopard) or Mac OS X 10.6 (Snow Leopard). Snow Leopard only works on Macs with an Intel processor. Older Macs with a G4 or G5 processor can only go up to Leopard.
The current Mac Pro uses the Intel Xeon Quad Core processor. Earlier incarnations would have had a G5 processor.
iMovie comes installed with all new Macs. The latest version can be purchased as part of the iLife software pack. The latest version of iMovie requires an Intel-based Mac, Power Mac G5 (dual 2.0GHz or faster), or iMac G5 (1.9GHz or faster) it will not work on older Macs. iMovie is also available at Best Buy (in the Apple section) and the Apple Store as part of the iLife package.
MAC OS X Leopard which it's current version is MAC OS 10.5.8, maybe 10.5.9 in the future if they ever come out with another update for Leopard.
A unique feature of the Apple G5 Mac Pro is the standard expansion slots for graphic adaptors and other expansion cards. The Mac Pro is the only Apple desktop that has this feature.
no it won't sorry :(