I have hundreds of altcoin rigs running 2-3 PSUs.....there is no reason not to especially since you can power the graphics cards off of higher end server power supplies at a fraction of the cost of an expensive ATX supply.
You can buy a cheap no name brand ATX psu to power the board and run a high quality PSU on the graphics cards.
I'm thinking of applying this to my build, but I'm not really familiar with Server PSU's .
The rig I'm doing is going to include 7 RX470's; will most PSU's around the 1200W work with this many GPU's? At a guess i'd say I'd need to do some electrical work on it to connect up the PCI-E plugs
I've been looking through ebay and found this one which might work?
http://www.ebay.com/itm/SUPERMICRO-PWS-1K41P-1R-1400-WATT-POWER-SUPPLY-USED-/332136930789?hash=item4d54e75de5:g:RiIAAOSwTuJYpMUZIf there's somewhere else I should be looking, do let me know