Comparison of PowerColor Radeon RX 5700 XT Red Devil video card vs Sapphire NITRO+ RX 590 8G G5 video card by specifications and benchmarks. PowerColor Radeon RX 5700 XT Red Devil runs at 1.770 GHz+ 10 % base clock speed and has 8 GB of GDDR6 memory, while video card Sapphire NITRO+ RX 590 8G G5 runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 225 W, and the second is 225 W. Compare the table of benchmark results to find out which graphic card is better.