3.9 vs 4.0

Does a 4.0 really boost your application in comparison to a 3.9?

No, as long as you’re in the top 10% of your class, your specific rank doesn’t really matter.

The big difference between 3.9 and 4.0 is 0.1. You’re fine.

In a vacuum, 4.0 is better than 3.9, but applications are not viewed in a vacuum, and there are many, many, many things that outweigh that extra 0.1

It does boost it, but there are more important things than 0.1