Intel Xeon X5660 's Advantages
Higher base frequency (2.8GHz vs 1.4GHz)
Larger L3 cache size (12MB vs 6MB)
Pentium 1405 V2 's Advantages
Released 3 years and 10 months late
Higher specification of memory (DDR3-1333 vs DDR3)
Newer PCIe version (3 vs 2)
More modern manufacturing process (22nm vs 32nm)
Lower TDP (40W vs 95W)