AMD Ryzen 9 3900X's Advantages
Released 1 years and 11 months late
Higher specification of memory (DDR4-3200 vs DDR4-2666)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (64MB vs 32MB)
More modern manufacturing process (7nm vs 14nm)
Lower TDP (105W vs 180W)
AMD Ryzen Threadripper 1900X's Advantages
Larger memory bandwidth (79.47GB/s vs 47.68GB/s)