Intel Xeon E5 2603 v2 's Advantages
Released 1 years and 6 months late
More modern manufacturing process (22nm vs 32nm)
Lower TDP (80W vs 95W)
Intel Xeon E5 2658 's Advantages
Higher base frequency (2.1GHz vs 1.8GHz)
Larger L3 cache size (20MB vs 10MB)