For me it's all about versatility. I have an Athlon 2500+ which isn't exactly state of the art these days, but it ain't bad. But I love racing games and, frankly, there is nothing in Mame....NOTHING...that comes close to comparing with the likes of Rallisport Challenge or Colin McRae or Midnight Club, etc. Really, there are a glut of fantastic racing games out for PC that aren't emulated and as much as I (and presumably my guests) will have a blast with Mame I want my cabinet to be as great as it can possibly be. Hence the decent processor and decent 3d card (another thing that is irrelevant when it comes to Mame).