What is better 4.15 and 1580 mhz or 4.0 and 1600 whats a better balance more cpu over ram?

What is better 4.15 and 1580 mhz or 4.0 and 1600 whats a better balance more cpu over ram?

4.15 without a doubt, but why don't you clock it to 4.2/1600 since you are already at 4.15. Can't be that hard to up another 0.05Ghz.