Do you keep your stock RAM or trade it in when you order more RAM for your Mac Pro. The 2.8 octo that I'm ordering comes with 2x1GB sticks. I will likely be adding 8gigs (4x2GB). OWC offers a trade-in value of $32.50 for my 2x1GB RAM sticks. The only reason I could see that is worth keeping the stock RAM is if anything goes wrong and you need to bring it into apple for repairs - they typically as you to send it with the stock RAM (ie, as close to stock config as you can).