Intel Xeon E3 1240 's Advantages
Higher base frequency (3.3GHz vs 1.3GHz)
Larger L3 cache size (8MB vs 1.5MB)
Intel Xeon D 1577 's Advantages
Released 4 years and 10 months late
Higher specification of memory (DDR3 vs DDR3)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 80W)