Comparison of Sapphire NITRO+ RX 590 8G G5 video card vs ASRock Radeon RX 5700 XT Challenger D 8G OC video card by specs and benchmarks. Sapphire NITRO+ RX 590 8G G5 runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory, while video card ASRock Radeon RX 5700 XT Challenger D 8G OC runs at 1.469 GHz base clock speed and has 8 GB of GDDR6 memory. The weight is different, -- vs --. The TDP of the first video card is 225 W, and the second is 225 W . Compare the benchmark results to find out which video card is better.