If you want to know for sure 45Drives offers the entire CAD model for download for us to answer these questions.
Based on my napkin math you can fit a card in the case with a height of ~141mm and a length of ~260mm. If you got a card that is slightly smaller in height and you remove the fan directly behind the PCI slots you could yeild an extra 25mm of clearance.
The height measurement is based off of the top of the PCI slot , NOT the motherboard.
I am currently unaware if 45Drvies provides any “official” measurements for GPU support.