Comparison of Sapphire Pulse Radeon RX 580 4G G5 video card vs ASRock Radeon RX 6600 Challenger D video card by specifications and benchmarks. Sapphire Pulse Radeon RX 580 4G G5 runs at 1.257 GHz base clock speed and has 4 GB of GDDR5 memory, while video card ASRock Radeon RX 6600 Challenger D runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 185 W, and the second is 132 W. Compare the table of benchmark results to find out which graphic card is better.