Intel Xeon E5606 's Advantages
Released 11 months late
Higher base frequency (2.133GHz vs 2GHz)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (80W vs 105W)
Xeon E6540 's Advantages
Higher specification of memory (1333 vs 3)
Larger L3 cache size (18MB vs 8MB)