It's funny, because his computer won't even touch more than 4g of it. Ever.
I do quite often max out my 16GB RAM on both of my main computers.
However that's quite easy with 4 monitors, say having a game on one, lots of graphics programs on another, etc. But I am studying for my CCG Level 4 so kinda have 'special needs' huehuehue. Home users won't need more than 8GB until technology advances more.