ladykyera999 Yes, that's what I wanted, although you could just list the values (1,735.4 and 1,817.1 MB) in the future. The point here is that in this save at least, you're nowhere near the danger zone in terms of RAM use. And your computer has enough memory installed that it's unlikely you'd be using it all while playing.
Do you notice a pattern of the Error 12s? As I mentioned, it's an out of resources condition, and the resource in question is usually memory, but not always. If you get the error after spending a lot of time in CAS or Build/Buy, that might be the problem. Both use extra resources that the game doesn't completely release when you go back to live mode.