Came over this:
2U Chassis + motherboard
SuperMicro 6028U-TRTP+ 2U BareBone Server w/ X10DRU-i+ 2x 1000W PWS With Rails | eBay
There are also some great deals on motherboard only.
SUPERMICRO MBD-X10DRL-I ATX Server Motherboard Dual LGA 2011 R3 Intel C612 | eBay
SUPERMICRO MBD-X10DAI E-ATX Xeon Server Motherboard Dual LGA 2011-3 Intel C612 | eBay
Intel Xeon E5-2678V3 230 USD
Tested Intel Xeon E5-2678V3 SR20Z 2.5GHz 12 Core 30MB 6.4GT/s 120W Processor CPU | eBay
RAM 80 USD per module
1x16gb Samsung M393A2G40DB0-CPB DDR4 16GB 17000R 2133 2rx4 ECC SERVER Memory Ram 801040832510 | eBay
You still get more bang for your buck with a X9 system, but Haswell comes with slightly better power efficiency, performance(especially improved branch prediction) and AVX2.
2U Chassis + motherboard
SuperMicro 6028U-TRTP+ 2U BareBone Server w/ X10DRU-i+ 2x 1000W PWS With Rails | eBay
There are also some great deals on motherboard only.
SUPERMICRO MBD-X10DRL-I ATX Server Motherboard Dual LGA 2011 R3 Intel C612 | eBay
SUPERMICRO MBD-X10DAI E-ATX Xeon Server Motherboard Dual LGA 2011-3 Intel C612 | eBay
Intel Xeon E5-2678V3 230 USD
Tested Intel Xeon E5-2678V3 SR20Z 2.5GHz 12 Core 30MB 6.4GT/s 120W Processor CPU | eBay
RAM 80 USD per module
1x16gb Samsung M393A2G40DB0-CPB DDR4 16GB 17000R 2133 2rx4 ECC SERVER Memory Ram 801040832510 | eBay
You still get more bang for your buck with a X9 system, but Haswell comes with slightly better power efficiency, performance(especially improved branch prediction) and AVX2.