The Radeon RX 550 graphics card from ASUS is one option for you if you're upgrading your computer. It has a 2 GB GDDR5 memory.
From Amazon
ASUS Phoenix AMD Radeon 550 Graphics Card (PCIe 3.0, 2GB GDDR5 memory, HDMI, DisplayPort, DVI-D, IP5X, Dual ball fan bearings, Auto-Extreme)
Memory C
ASUS PH-550-2G AMD Radeon RX 550 2 GB GDDR5
Clove Technology
ASUS PH-550-2G AMD Radeon RX 550 2 GB GDDR5