what are the main difference ? i'm still a noob in this, yet i wanna know more regarding about it..

other than the motherboard difference (where you need better board to support 3820), and the Ghz is 3.4 for 3770 and 3.6 for 3820

and the price is ALMOST similar..

should i invest in 3770 now? or save up for 3820 in the near future?