AMD Ryzen 9 5900 's Advantages
Lower TDP (65W vs 350W)
AMD Ryzen Threadripper 7980X 's Advantages
Released 2 years and 9 months late
Higher specification of memory (5200 vs 3200)
Larger memory bandwidth (166.4GB/s vs 51.2GB/s)
Newer PCIe version (5 vs 4.0)
Higher base frequency (3.2GHz vs 3.0GHz)
Larger L3 cache size (256MB vs 32MB)
More modern manufacturing process (5nm vs 7nm)