that double click was for those original mouses that came with mac desktops.
we compared specs and some fps readings . the result was close to even. he had higher freq. ram on him but that doesn't change anything - just gives you more room for messing with over clock. as far as cores go his i3 isn't far from my duo.
so. difference wasn't 600$ worth
MB limitations? its def to have 4 ram slots on mb. so you go and get four 8 gb modules and here you go - 36 gb or ram. now you can buy mb that also support 2 processors - add two of i9 extreme and you'll be running all the stuff that comes out in next 10 years
thou it might be more expensive than mac at that point...