Comparison of Sapphire Nitro+ Radeon RX 6900 XT video card vs PNY RTX A4500 video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card PNY RTX A4500 runs at 1.050 GHz base clock speed and has 20 GB of GDDR6 memory. The TDP of the first video card is 340 W+ 13 %, and the second is 200 W. Compare the table of benchmark results to find out which graphic card is better.