Comparison of SAPPHIRE PULSE RX 550 4G G5 640SP video card vs SAPPHIRE PULSE RX 550 2G G5 640SP video card by specs and benchmarks. SAPPHIRE PULSE RX 550 4G G5 640SP runs at 1.019 GHz base clock speed and has 4 GB of GDDR5 memory, while video card SAPPHIRE PULSE RX 550 2G G5 640SP runs at 1.019 GHz base clock speed and has 2 GB of GDDR5 memory. The weight is different, -- vs --. The TDP of the first video card is 65 W+ 8 %, and the second is 65 W+ 8 % . Compare the benchmark results to find out which video card is better.