Currently, there are 30 GPU's in my farm total. 5 rigs of 6 cards each. 4 of the rigs are running Gigabyte R9-380's, 6 cards each for 120 MH/s per rig. I built one rig, using 6 of the R9-290/390 family that hashes at 180 Mh/s.
PSU's on the 380 rigs are EVGA 1300 watt Gold rated. PSU on the 290/390 rig is EVGA 1600 watt Gold rated.
All Asrock BTC H81 Motherboards, Celeron Dual cores, Powered USB 3.0 1x to 16x risers.
5 Dedicated outlets in my garage off the electrical panel. $0.10 KWh costs.
Very cool, honestly I think GPU rigs are probably the safest bet, very good warranties and a great resale on them. I mean look at the life of 7950, it launched January 2012 and it is still being used to mine. This rig could go on for a very long time if you need it to.
I have KNC Titan rigs (4 now) and mine LTC...I did some figures in the past and at the current LTC prices (if I remember right) on
www.litecoinpool.org/calc (nice ltc calculator anyone can use) at 14c kwh for 1000mh and 4000 watts *using gen tarkins firmware figures*
I THINK you get 1/2 a Titan Cube in $$$ of what you would get at around 9 bucks at an ethereum price.. plus.. on say a Sapphire 7950 3gb ..which is what I had when doing figures.
(sold it ...had no time to put up with messing with a 1 card rig )
SO...if you have cards or IF you want to say mine with a NEW GPU on the card till ethereum all goes POS coin ....to bet your card (on paper at least) for a discount
and or free (depending I guess on if you hold ethereum or cash it all out to btc or usd)
then hey go for it
but from what I understand (or last I heard) the ethereum coin is gonna go POS coin around the latest estimate I heard was Feb 2017? correct me if wrong...
but anyway ....not a bad bet if you need/want a couple GPU cards or again have some laying about

just figured folk would want the comparison
also if my figures are way way off on ethereum and say it is is better then 1/2 a titan cube etc etc feel free to correct me.....again I did the figures
but don't have the time and had only the 1 card...so this is what I remember (i think I'm close)

Hope as a 'ballpark' this is helpful in that GPU mining Ethereum and KNC Titans mining whatever scrypt imho seem the only way a home miner can do more then just OK.
anyway stuff to do
