Is it still worth it to buy GPUs and create a GPU farm (prolly no more than 5)
To mine Altcoins (using multipool) ?
I currently just mine with a single GPU and get about 300 KH/s so either want to stop or go bigger xD
Wait for R9-290x and see if its really much better for mining.
If that card can use under 200 watts, then it might be worth it.