It still beats the other two fans though.
I retested the NF-A9-14 after testing the NF-A9 as a control and as you can see I did get slightly higher temps then my initial test 2 weeks ago. System: Inwin Chopin with Asrock Fatal1ty B450 ITX/AC and a delidded 2400g running at 3900 1.35 volts with a Noctua Nh-L9a CPU cooler. Since I was looking for new ways to procrastinate I tried it, here are the results. I did some tests on switching out the CPU cooling fan on my NH L9a, and some people thought my replacement fan was a bad choice/ I should try a Noctua 25mm. Posting this here in case it helps anyone.