Gotta love decommissioned servers...   Anyway these are starting to hit the used market and are getting affordable. The 2U series such as the R720 would make a great medium sized unraid box. They can use V1 and V2 XEON 2XXX series socket 2011 chips. They can handle ALOT of ram, last head count was 786 gig of ddr3 1600-1866mhz depending on the cpu. They need 2 cpus to take advantage of all the expansion and ram slots.  You are down to 4 8x pci-e slots(and one will be a sas controler) i