Intel Xeon Gold 6421N 's Advantages
Lower TDP (185W vs 270W)
Intel Xeon Gold 6554S 's Advantages
Released 11 months late
Higher specification of memory (DDR5-5200 vs DDR5-4400)
Higher base frequency (2.2GHz vs 1.8GHz)
Larger L3 cache size (180MB vs 60MB)