Question about Corsair iCUE 220T RGB Airflow

It's too tight, in my opinion. I had a GTX1660S (28cm) installed, which was ok. For a short time, a Windforce GTX770 (29.2cm) was also installed, which was very, very tight. Yours should be too big with 30cm. I would only install graphics cards with a maximum length of 29cm in the case.