You don't need SLI or crossfire for mining, you can mix cards.
Unless Groovy1962 is right about the ETH mining timebomb has been delayed, investing in hardware for ETH right now is foolish. Another factor is if ETH its self is a bubble but that is a topic for the altcoin discussion section far as going in depth on that one.
The 480 will hash more and consume less electric than the 970. Don't invest in hardware on a random whim. Put some consideration into whether or not this mining surge will last long enough for your hardware investment to profit. If mining is short lived you may be better off with the 970 since it can SLI for gaming and make 1/3rd to 1/2 an ROI at least
Thanks for the quick reply! I'm seriously thinking of buying a rx480 then, cause I'm kinda feeling lucky with ETH.
Do you think that my PSU - 750 Watt Corsair RM750i Modular 80+ would be enough to power both cards?
750 watts is enough to run 2 rx 480s on a stock bios.
You can run 4 cards with a undervolt and have plenty of safety margin, for me at the wall 4 card rx 470/480 consumes less than 550 watts @ 27 mh per card.
Consider building a frame so you can add more gpus in the future, if profit holds out we always end up expanding, nature of the game.
Yep, I'm considering building a 6 gpu rig with a big frame in the future, but for the beginning I started with buying an MSI rx 480 which should arrive in a few days.
Regarding the voltage, is there any software that can tell me how many watts the gpu is consuming?
Use corsair-link PSU and corsair-link software. It tells You exactly how much power is rig using. Measured with killawatt also and there was no difference at all.
Just for info: 6X MSI RX480 8G - ETH 800W in total, XMR 650W, ZEC 750W.
