Powercolor Radeon RX 6600 is one option for you if you're upgrading your computer. It has an 8 GB GDDR6 memory. The size of this card means it requires 2.2 slots.
From Amazon
PowerColor RX 6600 8GB Hellhound OC 8G AXRX 6600 8GBD6-3DHL
Overclockers
PowerColor Radeon RX 6600 HellHound 8GB GDDR6 PCI-Express Graphics Card
Scan
PowerColor AMD Radeon RX 6600 Hellhound 8GB Graphics Card