I assume he means different versions of the same console(s) whether it be regional (PAL vs NTSC etc.), version (I.E. 20 gb phat xbox all the way up to new 320 gb slims), and more importantly limited edition consoles and packages (i.e. GoW xbox or infamous PS3 bundle)
Granted I doubt anyone collects all of those variants but I think that's the general gist of it
Could be wrong of course