AMD Ryzen 7 5800X3D 's Advantages
Released 2 years and 2 months late
Higher base frequency (3.4GHz vs 2.9GHz)
Lower TDP (105W vs 280W)
AMD Ryzen Threadripper 3990X 's Advantages
Higher specification of memory (DDR4-3200 vs DDR4-3200)
Larger memory bandwidth (95.37GB/s vs 47.68GB/s)
Larger L3 cache size (128MB vs 96MB)