I found this out about GPU Compatibility from Razor X website.
Seems like the RX6000 series GPU cards are not supported by the external GPU enclosure: https://mysupport.razer.com/app/answers/detail/a_id/1727/kw/razor%20x%20chroma%20GPU%20compatibility
I believe the reason why is because Razor X doesn't supply enough power for the 6000 Series GPU cards.
The above list was updated on February 25,2021.
Not sure if you are aware of this Apple BOOTCAMP website but it is unofficial but the developer takes the latest AMD Driver and modifies it to work in Bootcamp OS: https://www.bootcampdrivers.com/
The latest AMD Driver at this website supports the 6000 series GPU cards.
EDIT: Found Razer Support concerning your Razer-X compatible GPU cards. It is almost the same as the previous list I posted except it is now showing the Nvidia RX3000 series as being compatible. It still lists only the AMD 5000 GPU cards as being compatible: https://mysupport.razer.com/app/answers/detail/a_id/2590
It is possible the list hasn't been updated yet since the 6000 Series GPUs are so new and are probably being tested by Razer for compatibility issues before being listed on their charts.
But this PC DIY website mentions that the Razer-X Chroma is compatible with at least the RX6800XT GPU cards: https://premiumbuilds.com/guides/best-egpus/
"As of right now, the number of professional benchmarkers or hardware testers looking into eGPU’s is limited, and the newest generation Ampere Nvidia GPUs and AMD Radeon RDNA2 GPUs continue to have major stock problems. The combination of these things means that pure eGPU comparisons for RTX 3080 (or 3090) or RX 6800/XT cards are limited, so much of the current analysis revolves around specification tracking and individual user opinions. Despite that, to accommodate the size/power draw of the RTX 3080 in particular, one eGPU has begun to rise to the top as the best option available. It shouldn’t come as a surprise considering how much we like its little brother, the Razer Core X. For an eGPU to use with the new RTX 3080 or AMD 6800/XT, we recommend the Razer Core X Chroma. This beefed-up eGPU enclosure from Razer not only adds a little RGB-goodness, gigabit ethernet support, and additional USB ports, but most importantly, gives that little extra PSU wattage to help even the newest, most powerful cards achieve top performance. While most examples of even the RTX 3080 wouldn’t exceed the power draw of the Razer Core X, the Chroma additional power and features are likely worth it to be sure you don’t risk peaking above the power draw maximum. There exists even one level higher within the Razer lineup, the Razer Core V2, but it isn’t easy to find in stock nowadays. Unless you are thinking of upgrading to a RTX 3090 later down the road, the $430 Razer Core X Chroma is a great product and our recommendation for an eGPU to pair with an RTX 3080 or AMD 6800/XT."
