If you dont' plan to overclock, you really don't need that much cooling, A nh d9l will work well here, and be more than enough for those chips stock, they really don't use that much power.
Is this going in a server rack? If so, just spin the fans faster as normally noise won't matter. Also depening on your rack, id stay away from anything that has side intakes.
I have a dual 2011 system in a. 4u case with some cheap deepcool coolers, and they work fine, and those chips use about the same power as a 5950x. You really don't need that much to run the chip at stock.