My work machine has 32 GB and it is more than enough for the 10-15k (1-3k unique) total occurrence assemblies that I create. I need to max it out at 8 GB (all the motherboard/chipset can fit). Inventor is ok, but add Windows overhead, a few Internet Browsers, Spreadsheets, PDFs and other programs running at the same time and switching between them becomes painful. My home machine(Win7, old i5 processor, integrated graphics) has 4 GB and it is not enough for anything other than trivial assemblies.
