Intel Xeon X5687 's Advantages
Released 1 years and 11 months late
Higher base frequency (3.6GHz vs 2.533GHz)
Larger L3 cache size (12MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Xeon E5540 's Advantages
Higher specification of memory (1066 vs 3)
Lower TDP (80W vs 130W)