AMD EPYC 9684X 's Advantages
Newer PCIe version (5 vs 4)
Larger L3 cache size (1152MB vs 16MB)
AMD Ryzen Embedded 8840U 's Advantages
Released 10 months late
Higher specification of memory (5600 vs 4800)
Higher base frequency (3.3GHz vs 2.55GHz)
More modern manufacturing process (4nm vs 5nm)
Lower TDP (28W vs 400W)