Sapphire Radeon RX 6800 is one option for you if you're upgrading your computer. It has a 16 GB GDDR6 memory.
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SAPPHIRE Pulse AMD Radeon RX 6800 16 GB GDDR6
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Sapphire PULSE RX 6800, 16GB DDR6, PCIe4, HDMI, 3 DP, 2170MHz Clock