Hello - I'd really appreciate some guidance. I have a Mac Pro 2. 2.66 GHz Dual-Core with 2GB 667 MHz DDr FB-DIMM memory. These are in 4 slots of 512 and EEC is enabled (whatever that means) I have used the crucial scanner that tells me I need to spend £100 and get EEC and Buffered RAM, but I have no idea if this is good / bad / true? Other shops have no guide and some say mixing the wrong memory will hurt my Mac. Any help would be really appreciated Thanks.