Intel Xeon E5507 's Advantages
Lower TDP (80W vs 87W)
Intel Xeon E3 1290 v2 's Advantages
Released 2 years and 2 months late
Newer PCIe version (3 vs 2)
Higher base frequency (3.7GHz vs 2.266GHz)
Larger L3 cache size (8MB vs 4MB)
More modern manufacturing process (22nm vs 45nm)