AMD Ryzen 7 2700 's Advantages
Higher base frequency (3.2GHz vs 2.9GHz)
Lower TDP (65W vs 280W)
AMD Ryzen Threadripper 3990X 's Advantages
Released 1 years and 9 months late
Higher specification of memory (3200 vs 2933)
Larger memory bandwidth (95.37GB/s vs 43.71GB/s)
Newer PCIe version (4.0 vs 3.0)
Larger L3 cache size (128MB vs 16MB)
More modern manufacturing process (7nm vs 12nm)