AMD Ryzen Threadripper 3990X 's Advantages
Larger memory bandwidth (95.37GB/s vs 51.2GB/s)
Larger L3 cache size (128MB vs 96MB)
AMD Ryzen 7 5700X3D 's Advantages
Released 4 years late
Newer PCIe version (4 vs 4.0)
Higher base frequency (3GHz vs 2.9GHz)
Lower TDP (105W vs 280W)