AMD Ryzen 7 2700E's Advantages
Lower TDP (45W vs 280W)
AMD Ryzen Threadripper 3990X's Advantages
Released 1 years and 4 months late
Higher specification of memory (DDR4-3200 vs DDR4-2933)
Larger memory bandwidth (95.37GB/s vs 43.71GB/s)
Newer PCIe version (4.0 vs 3.0)
Higher base frequency (2.9GHz vs 2.8GHz)
Larger L3 cache size (128MB vs 16MB)
More modern manufacturing process (7nm vs 12nm)