Hello. My dad has a Mac Pro, Not sure what year is it , And It could be great if you could help me find out. The specs are: Intel 2X 2.66 Ghz Dual Core Intel Xeon Memory 3GB DDR2 667Mhz And a Graphic card of nVidia 7300 GT 256mb. Now, He got a Mac OSX Tiger 14.11 , And I've been wondering if it's possible for him to upgrade to Mac OSX Snow Leopard, And if will it work fine on it? Or he should better stay with the Tiger OS... He's mostly using applications like Adobe Photoshop , Illustrator and all these graphics Adobe ones... Thank you so much!