TechPowerUp published a review on the Corsair iCUE 4000D RGB Airflow
A quote from the article:
With the launch of the AF120 Elite RGB fans, Corsair took the opportunity to relaunch the 5000D and 4000D cases as iCUE editions featuring the new cooling units. We take a walk down memory lane and see how the enclosure and its thermals compete, after two years, with the new fans in the mix.Corsair iCUE 4000D RGB Airflow Review