Xeon E5335 's Advantages
Higher specification of memory (DDR3
Depends on motherboard vs DDR3)
Higher base frequency (2GHz vs 1.9GHz)
Lower TDP (80W vs 115W)
Intel Xeon E7 4820 v3 's Advantages
Released 8 years and 7 months late
More modern manufacturing process (22nm vs 65nm)