I recently dropped my 11in Air and can no longer use it properly the display is cracked and its dented up. Fell down stairs when I tripped. I will be getting 8GB instead of 4GB this time and have a couple questions. 1. Is the i7 noticeably faster than the i5? 2. Does the i7 have a faster GPU than the i5? 3. Does the i7 have any thermal issues? 4. If YES to #3, does the fact the 13in is bigger let the i7 run cooler/throttle less than in the 11in?