Xeon L5645 's Advantages
Larger L3 cache size (12MB vs 8MB)
Lower TDP (60W vs 71W)
Xeon E 2124 's Advantages
Released 7 years and 5 months late
Higher specification of memory (2666 vs 1333)
Newer PCIe version (3 vs 2)
Higher base frequency (3.3GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)