It's still not cost effective.
These are HP BL460c blades.. around $6k each.  That buys a lot of fresh CUDA!

It's a fun way to do "burn in", but not a smart use of resources.
12 hyperthreading Xeon cores, though..  each.

22,500 khash/sec with -4way, and only 13,400 without, so yeah, it's not subtle.