Intel Xeon D 1548 's Advantages
Released 5 years and 8 months late
Newer PCIe version (3 vs 2)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 60W)
Intel Xeon L5640 's Advantages
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (2.266GHz vs 2GHz)
Larger L3 cache size (12MB vs 1.5MB)