Intel Xeon E5640 's Advantages
Larger L3 cache size (12MB vs 8MB)
Intel Xeon E3 1575M v5 's Advantages
Released 5 years and 10 months late
Higher specification of memory (DDR3 vs DDR3)
Newer PCIe version (3 vs 2)
Higher base frequency (3GHz vs 2.666GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 80W)