Oh wow you americans and your sick gpu deals...in france the custom 1080 ti models barely arrived and the best price i've seen so far is 750 on founders edition, usually they are around 800. Of course if you got deals like that it's a no brainer 
I'm running 5 rx 480 @ 730W at the wall on ETH, so yeah I run around 600W on ZEC, maybe 630W because I measured when the miner just started and the fans weren't running at cruise speed yet. That's the power of -100mv on core and modified timings...
I also saw someone that managed to get 500 h/s with custom memory timings on a R9 fury (HBM) but these guys don't give you the bios for free.
Modding your card is a personal decision, indeed if you don't mod your AMD cards (that looks like it's your case), you better buy nvidias. But for me that enjoy tweaking, optimizing and sending cards to RMA, the buying is not that obvious with vega coming along in june...basically I need really good deals
I'm running 5 rx 480 @ 730W at the wall on ETH, so yeah I run around 600W on ZEC, maybe 630W because I measured when the miner just started and the fans weren't running at cruise speed yet. That's the power of -100mv on core and modified timings...
I also saw someone that managed to get 500 h/s with custom memory timings on a R9 fury (HBM) but these guys don't give you the bios for free.
Modding your card is a personal decision, indeed if you don't mod your AMD cards (that looks like it's your case), you better buy nvidias. But for me that enjoy tweaking, optimizing and sending cards to RMA, the buying is not that obvious with vega coming along in june...basically I need really good deals