Hey all, Please excuse the dumb question. Just built a killer iMac 24 3.06 which is to arrive tomorrow. I elected to go with 4GB of RAM with the intention of buying 3rd party RAM to max out at 8GB. The issue is I don't understand how to get to the 8GB. Do I need to just purchase 4GB more of RAM or do I need to take out the existing 4GB and buy 8 GB separately? If I do have to rip out the 4BG and purchase the 8GB what do folks do with the factory installed 4GB? Was I an idiot for not just upgrading to the 8GB to begin with? Thanks everyone!