Ansys divides GPUs into two categories, one for display and one for accelerating computation.  Ansys tests a limited number of GPUs and lists the ones tested in a document.

Here is the pdf file that has the display adapters:

While a GeForce card will probably work for the display, it hasn’t been tested. In a professional environment, cards from the published list are recommended.

Here is the pdf file that has the list of GPU accelerator cards

In the past, these two lists had separate cards, but now I see the Nvidia RTX A4000 card is on both the display list and the accelerator list for Fluent!  This card has 16GB of GPU memory, so that might be a better choice for your needs than the RTX 4000 which has 8GB of GPU memory.