AMD Ryzen 7 1800X's Advantages
Higher base frequency (3.6GHz vs 3.4GHz)
Lower TDP (95W vs 105W)
AMD Ryzen 7 5800X3D's Advantages
Released 5 years late
Higher specification of memory (DDR4-3200 vs DDR4-2666)
Larger memory bandwidth (47.68GB/s vs 39.74GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (96MB vs 16MB)