I'm confused does your energy costs scale? (like you don't get charged a flat rate?)
Because - sometimes using more energy results in a higher coin/watt. Oh right - regarding your PSU I believe each specific PSU will have a efficiency curve - so I'd consult that.
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With that said, you might want to consider grabbing a better power supply. I don't remember if you said in your other post but you should be using platinum or higher. (I pref Ti's but that's because I'm probably a bit crazy)
I'd have to change my contract to get a different rate.
Power curve of the PSU I'm using:
http://www.thermaltake.com/products-model.aspx?id=C_00001965
One more card would bring me close to 50%
Hm, maybe a new PSU is in order if power is significant issue for you - My EVGA 750Ti runs at 94%+ (supposedly, though the curve / load graph seems to be elusive).
I got this one very cheap second hand.
The costs I could save wouldn't match the costs for a new PSU.
Yeah - you'd have to be running a bigger rig to see effects more often - but, for the sake of efficiency you might as well go 6 - 7 Gpus.... DOOOOO IT :3. I'll be at 7 soon (tomorrow) if my mobo/os cooperates.
My board has exactly 2 PCI slots :D
I will see if I can find an upgrade somewhere :D
Yeah - if you are also trying to everything on a super tight budget you might consider a m.2 to PCI-E converter to get an additional gpu on your board if that is more financially more reasonable than getting a 6-7 mobo. I heard it can work, but I cannot speak for yours specifically.