AMD Ryzen 7 1700 's Advantages
Lower TDP (65W vs 105W)
AMD Ryzen 9 3950X 's Advantages
Released 2 years and 8 months late
Higher specification of memory (3200 vs 2666)
Larger memory bandwidth (47.68GB/s vs 39.74GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (3.5GHz vs 3.0GHz)
Larger L3 cache size (64MB vs 16MB)
More modern manufacturing process (7nm vs 14nm)