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Chino de Oro
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Posted July 19th, 2023 15:00
Have you try to update the firmware of your RTX card.
https://www.dell.com/support/home/en-us/drivers/driversdetails?driverid=35r91
This firmware supports Resizable BAR feature to improve the gaming performance.
It's compatible with Precision 3640, 3650, 5820, 7820, 7920, all XL included.
Chino de Oro
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Posted July 20th, 2023 14:00
If you follow the link, scroll down and look at compatible systems, you will see a list of all supported machines including the Precision 5820 XL.
How were those machines compatible with one graphics card and not the others, I would not know.

mazzinia_
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Posted July 21st, 2023 09:00
Hello,
first of all, all firmware updates offered by dell are working only on cards manufactured for dell ( or hdd/ssd sold as dell parts ).
For cards manufactured by others, either check if the maker has some update or if nvidia has something directly available.
Secondly, the bios of the computer must also support resizable bar, and as far as I know, is not an option offered in the 5820/7820/7920 bios