Hi All I just bought samsum 4gb ram stick for my 2010 mac pro. the website from which i bought it said it was ECC. I installed it and when i go to about this mac, it tells me that this RAM is not ECC. I kept the 3gb of the original ram in the machine. So i am a bit puzzled how it is possible that my apparently now non ecc ram works with the original ecc ram. I did not think it was possible. Or am i damaging my mac by mixing two types of memories?