Comparison of Sapphire Pulse Radeon RX 590 8G G5 video card vs SAPPHIRE NITRO+ Radeon RX 6600 XT video card by specifications and benchmarks. Sapphire Pulse Radeon RX 590 8G G5 runs at 1.469 GHz base clock speed and has 8 GB of GDDR5 memory, while video card SAPPHIRE NITRO+ Radeon RX 6600 XT runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 225 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.