Intel Xeon E3 1105C 's Advantages
Larger L3 cache size (6MB vs 1.5MB)
Lower TDP (25W vs 45W)
Intel Xeon D 1520 's Advantages
Released 2 years and 10 months late
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (2.2GHz vs 1GHz)
More modern manufacturing process (14nm vs 32nm)