Intel Xeon E5 4640 's Advantages
Larger L3 cache size (20MB vs 8MB)
Intel Xeon E3 1575M v5 's Advantages
Released 3 years and 8 months late
Higher specification of memory (DDR3 vs DDR3)
Higher base frequency (3GHz vs 2.4GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (45W vs 95W)