I really want to know who's telling the complete truth about RAM upgrades for a Mac Pro. OWC insists that RAM modules should only be purchased in matching pairs, while CRUCIAL.com maintains that the Mac Pro does not require matched pairs of modules. Who's telling the whole truth? The RAM capabilities of my Mac Pro are, according to CRUCIAL.com . . . Maximum Memory: 16384MB Slots: 4 (4 banks of 1) Standard Memory: 3072MB removable USB Support: 2.x Compliant Q: What memory goes into my computer, and will a faster speed be backward-compatible? Q: How much memory can my computer handle? A: 16384MB. Adding the maximum amount of memory will improve performance and help extend the useful life of your system as you run increasingly demanding software applications in the future. Q: Do I have to install matching pairs? A: No. No, you can install modules one at a time, and you can mix different densities of modules in your computer. But if your computer supports dual-channel memory configurations, you should install in identical pairs (preferably in kits) for optimal performance. Q: Does my computer support dual-channel memory? A: No. Your system does not support dual channel. Q: Does my computer support ECC memory? A: Yes. Your system supports ECC. You can put non-ECC modules into an ECC system, but be sure not to mix ECC and non-ECC modules within a system. Install the same type of modules that are already in your system. Maybe OWC is telling the whole truth and not just trying to sell double the volume of RAM purchases to gullible Mac Pro owners. Someone tell me who's being honest and who's pulling the wool over our eyes.