I'm sure this question has come up a lot, however doing a search I really couldn't find anything about it. D= Mac Life just posted an article about upgrading mac's. One thing that caught my eye was the memory category, it mentioned that current MP's can use DDR3 DIMM's but it dose not mention if they have to be ECC. Looking at one of there resources crucial.com, their MP 1,1 memory FAQ page has "Does my computer support ECC memory? A: Yes. Your system supports ECC. You can put non-ECC modules into an ECC system, but be sure not to mix ECC and non-ECC modules within a system. Install the same type of modules that are already in your system." My question is, has anyone tried nothing but Non-ECC memory DDR3's in there MP? and how well as it worked if anyone's tried it?