Intel Xeon E5 2689 's Advantages
Higher specification of memory (1600 vs 4)
Higher base frequency (2.6GHz vs 2GHz)
Larger L3 cache size (20MB vs 1.5MB)
Intel Xeon D 1540 's Advantages
Released 3 years late
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 115W)