See here https://mysupport.razer.com/app... under "Specifications" -> "Inner Dimensions".
It is also worth reading the FAQs or user manuals (also available on the same page).
On the product page itself you will also find graka compatibility information: https://www.razer.com/gaming-egp...

I for one am really satisfied with the case. But I didn't install an RTX card, because the data throughput is limited
is limited by Thunderbolt 3 anyway and an RTX is not necessarily worth it. Therefore, everyone has to know for themselves whether that is ok or not ;-)

Unfortunately, I can't comment on this because I don't know the dimensions. It has been running with an rtx 3080 for a long time. The case fan has gone off at some point, but otherwise no problems.