Yes sir, you guess correctly, Corsair h100i AIO fans I swap out for Noctua fans in 2019. The stock H100i Fans that came with the AIO sounded like a jet engine on startup, then beginning in 2019 it started to have weird noise rattling issues, like not enough oil in the fan bearings. One reason why I change to Noctua fans. Attached 2 images, 1st one is my Corsair Carbide 540 case from side view for reference. 2nd one is Corsair Link Temp stats for H100i w/ i7 4790k as of June 13th, 2023. Not sure if you are interested but I'm open to giving away my functioning H100i when I upgrade my PC sometime Q4 this year. If you're interested in tearing apart my H100i and take a look inside.