Intel Xeon E5640 's Advantages
Lower TDP (80W vs 220W)
Intel Xeon W 3323 's Advantages
Released 11 years and 4 months late
Higher specification of memory (DDR4-3200 vs DDR3)
Newer PCIe version (4 vs 2)
Higher base frequency (3.5GHz vs 2.666GHz)
Larger L3 cache size (18MB vs 12MB)
More modern manufacturing process (10nm vs 32nm)