I have a Mac OS X Version 10.4.11 with a 2.4 GHz Intel Core 2 Duo and a memory of 1 GB. Today I went to the Mac store to buy the Sims 3, but it needs Version 10.5.7 and 2GB. So am I supposed to just buy OS X 10.5.0 and then update it from there? And then do I have to buy another 1GB? Here's the link for that 1GB module http://store.apple.com/us/product/MB320G/B Is this the correct product (for OS X 10.5.0): http://store.apple.com/us/product/MB607Z/A If this is correct than I don't think I should even bother getting the Sims 3. Please help?