Xeon L7555 's Advantages
Higher specification of memory (1333 vs 3)
Higher base frequency (1.866GHz vs 1.6GHz)
Larger L3 cache size (18MB vs 4MB)
Intel Xeon E5603 's Advantages
Released 11 months late
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 95W)