the i5 is 200 points ahead on it's CPU mark rating and 400 points ahead on single thread. But the i7 uses significantly less power.
I suppose I can swap processors and Geekbench them, I just hate the TIM I had bought as it's messy to work with, so swapping processors is a PITA. I think for raw performance that the i5 would be better for gaming. But the i7 is technically a "high end" CPU. I'll do some more research. I think the most notable feature is the i7 has hyper threading capabilities.