I was thinking of moving up to 5 accounts from my current 3 but not sure if my PC will handle it. What is the lowest spec of machine that someone has boxed 5 accounts on?

I am going to try with 2 trial accounts plus my 3 normal ones to see how it goes but that might be fine in starting areas but is no indication of how it will handle in an instance or busy areas of outland/northrend.