The RTX 4080 and the RX 6800 XT both have 16GB of VRAM, but the type of VRAM used by these cards is different. The RTX 4080 uses GDDR6X memory, which is a more advanced and faster version of the GDDR6 memory used in the RX 6800 XT. Although the RX 6800 XT uses GDDR6 memory, it is still an excellent memory type that delivers excellent performance.