AMD Ryzen Embedded 8840U 's Advantages
Higher base frequency (3.3GHz vs 3.25GHz)
Lower TDP (28W vs 200W)
AMD EPYC 9255 's Advantages
Released 6 months late
Higher specification of memory (6000 vs 5600)
Newer PCIe version (5 vs 4)
Larger L3 cache size (128MB vs 16MB)