Third party RAM for my Mac Pro

I have a 1st generation Dual-Core 2.66GHz/4GB Mac Pro desktop. I want to install 16 GB total, from a third party. I'm not very computer savvy... and I'm not sure which third party offers the ram most suitable for my particular machine, or which pairs I'm better off purchasing, etc. If anyone knowledgeable enough to put me in the right direction could give me some advice I'de really appreciate their input. Thanks guys.

You will need 667MHz FB-DIMMs. If you are thinking about upgrading to a 2nd gen MacPro, then you can get 800MHz ones. In 1st gen they will operate at 667MHz but you will be able to swap them into a 2nd gen if anything. If you are not planning to upgrade anytime soon, then forget what I just said and go for teh 667MHz ones.
If you are not planning to ever want more than 16GB RAM, then 8x2GB is a good choice. Or you can get 4x4GB.
Now, there is Apple Certified and Apple Qualified FB-DIMMs. Its basically the same thing but Apple Certified ones are much more expensive just because they are "certified" by Apple. Qualified memory is the same thing, but it has not been certified by Apple. Same reason why Apple brand memory is much more expensive. I am using qualified memory myself.
http://eshop.macsales.com/shop/memory/Mac-Pro-Memory
Hope this helps.

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