By the time you get those cards you are searching for they'll be earning 25% less.
The impact of every AMD video card on the planet coming online:
http://www.coinwarz.com/difficulty-charts/ethereum-difficulty-chart
Yep, buddy of mine just lit up a 240 GPU mini farm last week hashing 7GH on ETH. Planning to add another 400 cards over the next few weeks, slowly turning into a mini whale.
Omg. It's the cancer of this planet - looking for more profit, when difficulty is going skyhigh... Why everybody can't be good with 10-20-50 gpus even 100. No everybody whose in take not 10 but 200 cards burning lots of power (especially in Ukraine or Russia or Belarus where power cost is 2-4c), they mine like hell, but it's going to be less for everyone when they try to catch up with the biggest cake... 1000 gpus farms are now small... My god what it has ddone. About 19M Cards is mining eth alone? WTF?