AMD Ryzen 9 5900X 's Advantages
Newer PCIe version (4.0 vs 3)
Higher base frequency (3.7GHz vs 3.6GHz)
Larger L3 cache size (64MB vs 16MB)
AMD Ryzen 5 5500GT 's Advantages
Released 3 years and 3 months late
Larger memory bandwidth (51.2GB/s vs 47.68GB/s)
Lower TDP (65W vs 105W)