The Dell R815s that I got are running rock solid.
Hard to justify the price at this point, though, IMHO -- unless you get a sweet deal.
Well... I have to take that back a bit now.
My power flickered last night thus turning off all my hardware. Came in, turned all the Dells back on... started XMR-STAK on them all & walked off.
Noticed my pool hash-rate never returned to how it was... every one of my R815s is now ~400 H/S slower than they were before the power flickered (1600 H/S vs. 2000 H/S).
I've tried re-booting and even re-compiling XMR-STAK... seems to be permanent ?!
Any ideas ?