As i said, GPU mining will be irrelevant, probably next year.
Go to page 1 and read my comment there.
Now, Just to give you some tips. Only 6.000GH/ in the network ETC hashrate can make the coin profitable or unprofitable. A friend of mine is mining with 10 gpus at 278mh/s ETC. If the hashrate gets to 15.000GH/s, the profit goes to 0. literally 0.
When ETH goes POS, there are at least 150.000GH looking for a new "home". So you can pretty much predict that once ETH goes PoS, ETC will die aswell. We are not even talking about getting little profit. You´ll lose hundreds of $ in electricity for what you receive. Unless ETC gets it's value x30 (which i can tell you, it will not happen).
All minable coins will get their profit destroyed the next day ETH goes PoS, so GPU mining will die? probably not. What will die is your profit. You will still be able to mine ETC, but at a loss. Or Monero, at a loss. Or even Ravencoin, at a loss. Any profitable coin will die the next day.
Now, have you read about Bitmain? It's going to increase 50% their current hashrate. They are building new chips to mine Bitcoin, 50TH/s each. they are building 600K chips. So, small BTC miners.....you know what that means. You can count with the fingers of 1 hand how many coins are still ASIC resistant and profitable to mine. Probably you´ll end up not needing 2 or 3 fingers of that hand to count them. and those will get REKT the next day of ETH PoS. Is this looking good? no, it isn't. It's a f*cking disaster let's be clear.
i don't see future on this. And investing into mining is the dumbest thing you can do right now (unless you invest into solar power) which....BTW, will not save your problem since the hashrate of all left coins will be so big you´ll not be on profit even on solar power. So...the thing looks so terrible, that you may not be on profit even investing on solar power because the hashrate of the mineable coins will skyrocket. If there is no increase in value, well...you know....that's game over for the vast majority of miners.
Ohh BTW, someone said that nowadays a lot of coins are appearing and that they are mineable. That's false. brutally FALSE. There are not appearing mineable coins. And there are no future project (to my knowledge) planned to release one. So....We have what we have, and no good news on new mineable coins