Difference between +200 and -200 offset method on undervolting?

https://preview.redd.it/tkcryo86uijh1.png?width=1402&format=png&auto=webp&s=6211baa05eedf6b3ab2b0138e6bfc17946cf3f42

https://preview.redd.it/knkbukd9uijh1.png?width=1388&format=png&auto=webp&s=b8b6ec46f9fef55570b07f3e45e93a30bd6ade69

What's the difference? They are both capped at 900/1930. The only difference are the voltages/clocks before that point. So before gaming phase. Can someone explain??