Xeon E 2234 's Advantages
Released 7 years and 2 months late
Higher specification of memory (DDR4-2666 vs DDR3)
Higher base frequency (3.6GHz vs 2.5GHz)
More modern manufacturing process (14nm vs 32nm)
Lower TDP (71W vs 95W)
Intel Xeon E5 2640 's Advantages
Larger L3 cache size (15MB vs 8MB)