My current Lab Esxi host is a Dl360 G7 with 76GB of ram and 2x L5640. Running local storage with 15K drivers for right now. I think I will likely be replacing it with a Supermicro 4U box as that will kill two birds with one stone. Jumping up to a 4U chassis also allows me to roll my NAS into the same box and just run all of my equipment out of one box. From a value standpoint I am unsure if I should look for something socket 2011 or look for another server running dual L5640. In real world usage would I see any power saving with Dual E5's? which models would I want to look for? it looks like dual L5640 would run about ~600 so that is kinda my starting point. If E5's bring enough value to the table I am ok with spending more.