I'm looking into RAM for the Mac Pro that I've yet to buy. Fastermacs.com is soooo much cheaper than Apple, but they have two levels of RAM that confuse me: "OWC Mac Pro Certified" and "OWC Apple Qualified." I've read their descriptions of the two and so I'm aware of the technical difference, but is there a practical difference? The "Qualified" RAM is cheaper by $100 (looking at 2x2.0 GB for now), and so I would much rather go for that since I can purchase Parallels and an upgrade to my Igor Pro software for the difference. So my question is, is there a practical difference two the two? Is the "Qualified" RAM going to screw up my machine, crash and burn, etc.? Or is it just a marketing thing and they have to pay more for it to be "Certified" and it's really just as good?