Dude, Where's My 4 Gigabytes of RAM?

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Mac Pro handles up to 16GB of RAM and 3TB of disk space.

Two 3GHz 64-bit Dual-Core Intel Xeon “Woodcrest” processors.

http://www.apple.com/macpro/specs.html

And with Parallels, you can run Windows, Linux, and MacOS x at the same time.

http://developer.apple.com/documentation/Performance/Conceptual/ManagingMemory/Articles/AboutMemory.html