Given the changes between HW and Stormblood going from an i5-2400 to an i7-3770K mid-HW, the CPU usage didn't seem to change all that much. As far as gaming goes, the i5 IS the better candidate (assuming it doesn't have hyperthreading in your intel i5 system), as the lack of hyperthreading means that it isn't splitting each core into 2 virtual cores (unlike on my i7)