Also seems that "Keccak" is a real winner on my GTX-1080 machines --they have been sticking to it pretty much all day since the update to Nice Hash enabling it.
Alot of people seem to have avoided the standard 1080 like the plague... but I've been pretty satisfied with mine.
so your go to machine is the T5500 hopefully getting the 875 or 750w factory power supplies from dell, using sata to 6+2 pin connectors and risers and 1060s, 1070s, or 1080s correct? This setup looks awesome I just have a question about the power did you install a power distribution unit kit or all separate receptacles by my calculations if each rig is pulling 600 watts you could put 4 on a 20a breaker or 5 on a 30 to give some headroom? I have a couple rigs setup using the 1200 evga platinum and looking at new housing for the other RX cards I have and these look like good ideas
I have used a few of the Dell T5500s -- dollar for dollar they are an awesome value. The ones I am using are all 4x GTX-1060 so I use 2x factory 6-pin + a CPU Power to dual PCI-Express power adapter. They also have the 875-watt PSU.
My actual go-to is the HP Z400 -- although I have to change the PSU I actually prefer the internal layout (more open).
As for the power -- I am running 8x 20-amp circuits at the moment. I have each system tuned to be 500-550 watts. I am trying to keep it down to 3 per 20-amp circuit for plenty of headroom.
Read about the fans.