What kind of cpus would get you so much hashrate? We're at block 150k, 2.5x less coins per block is near

I've got a full M1000 with 16 M620s running 2 X Intel 2650's; it's a DR setup that's idle 360 days out of the year.
DR setup = Disaster Recovery?
Yeah, it's a warm site for disaster recovery. If SRM (site recovery manager) kicks off the first step is to kill the running batch files. We're paying for circuits, not for power usage, so the boxes might as well be doing something.