Comparison of MSI GeForce GTX 1080 Ti LIGHTNING X video card vs XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming video card by specs and benchmarks. MSI GeForce GTX 1080 Ti LIGHTNING X runs at 1.480 GHz base clock speed and has 11 GB of GDDR5X memory, while video card XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming runs at 1.480 GHz base clock speed and has 12 GB of GDDR6 memory. The weight is different, 1707 g vs --. The TDP of the first video card is 250 W, and the second is 250 W . Compare the benchmark results to find out which video card is better.