As others have stated, you cannot upgrade the motherboard, you have to buy a different model Mac Pro, so you would need at least a 4,1 to use DDR3 RAM.
I've been looking up older mac pro's because I can't wait to see what Apple will do next. Although the 21.5" iMac's 5400rpm hard disk is said to be faster than older 7200rpm's, I don't want to buy that iMac until someone confirms they can open and upgrade the hard drive.
In either case, I want to buy an older motherboard. Any recommendations on where to get it?
I've been looking up older mac pro's because I can't wait to see what Apple will do next. Although the 21.5" iMac's 5400rpm hard disk is said to be faster than older 7200rpm's, I don't want to buy that iMac until someone confirms they can open and upgrade the hard drive.
In either case, I want to buy an older motherboard. Any recommendations on where to get it?
You can upgrade the hard drive in any iMac, its just a little tricky because you have to disassemble and take off the front screen, but it can be done, there are youtube videos on how to do it. What older motherboard are you looking for? For a Mac Pro or iMac?