Question OC I5-3570k or stock I7-3770

Jun 6, 2019
6
0
10
Hi, I asked this recently and got my answer but I have more questions.
  1. Is I7 3770 better for future gaming than i5-3570k that would be OC-d to ~4.5Ghz
  2. Is the non-K I7 3770 overclockable to 4.2 on a z68 mb (I read it could be done)
  3. If it is, what would you buy? An 4.5 i5 3570k or an 4.2 i7 3770?
Thanks!
MB is Gigabyte ga-z68p ds3.