I am probably a bit too ambitious with my plans to move up to a E5 V4 generation server. I should wait a bit longer for prices to drop on E5 V4 CPUs & DDR4 memory, and just stick with my L5640 & X5679 gen servers for now. They do what I need, other than suck a bit of power & long in the tooth. Always tough to stay current with my homelab budget, and SO priorities.
You have a great point on being able to build a half dozen E5 V2 generation servers for less money, more capabilities, & chance to network. I'll probably end up look for a solid E5 V2 generation SuperMicro Twin. Maybe I will get lucky enough to find a good deal on a SuperMicro 2027TR-D70QRF (2U size, 2 node of dual E5 v2 w/8 DDR3 slots, dual intel i350 + single Mellanox ConnectX QDR). I'll probbly be looking for same 2667 V2 CPUs as you, let me know if you find any great deals. ...BTW, what are you doing with requested 10 pairs of 2667 v2 CPUs?