Windows System Information, Dxdiag, About, will show if you have 32bit(x86) or 64bit(x64).
You must have Windows 64 bit for the card.
Ryzen 5 5600x, B550 aorus pro ac, Hyper 212 black, 2 x 16gb F4-3600c16dgtzn kit, NM790 2TB, Nitro+RX6900XT, RM850, Win.10 Pro., LC27G55T..