RAM Upgrade from 2GB to 4GB -- Lots of questions...

I have a MacPro with the two dual core processors. It has 2GB of RAM in the form of four 512GB 667MHz RAM chips.
I want to double my RAM to 4GB, and I wonder what's the best way to do that?
If I double the existing RAM, that would mean 4 more 512GB RAM chips, all running at 667MHz. That would use ALL my chip slots, so that's the most RAM I'd be able to have in that configuration.
So.. why not pull ALL the 512s and replace them with, say, 2 2GB chips? If I do that, could I not also upgrade to 800MHz chips? Is there any reason that 800 MHz chips would be incompatible with my MacPro?
I'm a bit skittish about hardware upgrades, so if anybody's got any suggestions for a resource that can guide me through the process, that would be helpful, too. I'm always afraid I'm gonna bust a pin somewhere and destroy the computer.
Thanks,
--PS

4gb of ram isn't really that much. you can add four 512 but you may want more ram at a later time. if you are sure you won't, then go for it. RAM is best adding in groups of 4, but has to be in sets of 2. I would add four 1gb of ram. There are diagrams you can search out to show how to most effectively and properly install it. That would give you 6 gb and that's a pretty decent number for most people. You could add two 2gb. It's not the most efficient method and would not sqeeze every bit of speed from the ram but it would leave two slots open for further upgrading if you so wished. If you aren't a Photoshop person or Final Cut Pro or other heavy user, and just use one application at a time, 4gb is probably adequate. RAM is inexpensive enough for most people with a macpro that going for four x 1gb and moving to 6 is my recommendation. If you do use two x2gb there is no need to remove the 512s other than to possibly move them. dunno about the 800MHz chips. I think you can use them but don't need them and won't make use of the added speed. I'd use all of the same type of RAM just to be cautious.

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