Intel Xeon E3 1275 's Advantages
Released 1 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.4GHz vs 2GHz)
More modern manufacturing process (32nm vs 45nm)
Xeon EC5509 's Advantages
Higher specification of memory (1066 vs 3)
Lower TDP (85W vs 95W)