Expecting delivery of a MacPro4,1 tomorrow, Plan to try and follow the usual upgrade path, 5,1 flash, High Sierra flash and finally Mojave flash. Really curious as to the best memory configuration 3 sticks or 4, and the reasoning behind it. Any help or explanations would be appreciated. Edit: My forum searching finally turned up something relevant, seems 3 sticks are recommended over 4, something to do with 3 memory channels. I could still use a little more clarification if anyone feels like adding any, but for now I think I'll mark my thread as "resolved"