Intel Xeon E5 2648L 's Advantages
Released 2 years and 1 months late
Newer PCIe version (3 vs 2)
Larger L3 cache size (20MB vs 8MB)
More modern manufacturing process (32nm vs 45nm)
Lower TDP (70W vs 85W)
Xeon EC5509 's Advantages
Higher specification of memory (1066 vs 3)
Higher base frequency (2GHz vs 1.8GHz)