Xeon E5345 's Advantages
Higher base frequency (2.333GHz vs 2.2GHz)
Lower TDP (80W vs 105W)
Intel Xeon E5 2658 v3 's Advantages
Released 7 years and 10 months late
Higher specification of memory (DDR4-2133 vs DDR3
Depends on motherboard)
More modern manufacturing process (22nm vs 65nm)