Opteron 6180 SE 's Advantages
Higher base frequency (2.5GHz vs 2GHz)
Lower TDP (140W vs 250W)
Xeon 6746E 's Advantages
Released 13 years and 4 months late
Higher specification of memory (DDR5-5600 vs DDR3-1333)
Newer PCIe version (5 vs 2)
Larger L3 cache size (96MB vs 12MB)