Just got off the phone with Apple. They offered me a special deal on free RAM (didn't know they did that), however we got talking about RAM. Here's what he said: If you have a Dual G5 PM, it's no good to have 2 RAM Cards that are different, ie. 512MB + 1GB, especially if they are different brand. He says you need to put in 2 identical cards or you will have major problems using the computer. I've never heard the dual ram part, but I've heard the same brands part. Is this really true or was he trying to get me to buy more RAM? Thanks.