First, thank you all so much for your openness and valuable information. I went from zero understanding to having 10 dual GPU machines all mining last weekend. I enjoyed the test but learned that Nvidia is really behind AMD in this game. That being said I'm building a dedicated rig instead of using my staffs un-used weekend and evening capacity. I have a half dozen extra Asus Nvidia GTX 690 Turbo with 2gb, the best i could get was 11mhs out of those. That was with CUDA, GenOil and stock etherminer. That was on Win7, 12Gb RAM, SSD, Stratum Proxy and all the different version miners listed above.
I have three extra PCs with a few PCIe slots each, ill de case them and use them to start my miner. I want to buy about $1500 worth of cards to put in them. Im worried about DAG size, should i go all 2gb, 3gb or 4gb? For pure ROI and longevity what cards do you think i should go with? I know the mining ether game probably only has 12 months left in it so what should i buy to maximize my ROI.
There was a lot of talk about the 7970 and 280x, is this where you think i should focus?
Thanks a lot, PS im still working on details but i must likely have a air conditioned server room with free power to put the rig in, so not afraid of using more power if the ROI makes sense.
Thanks a lot