Comparison of PowerColor Radeon RX Vega 56 video card vs PNY RTX A4000 video card by specifications and benchmarks. PowerColor Radeon RX Vega 56 runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card PNY RTX A4000 runs at 0.735 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 210 W, and the second is 140 W. Compare the table of benchmark results to find out which graphic card is better.