I just started GPU mining as well. Have 2 HD7970's tearing up some LTC! Not really looking to make a profit but if the rig pays for itself in a timely manner (not paying for elec) then I will consider it a smashing success!
Good luck to you!
As I do not want to create new topic I want to ask is it still good idea to do GPU mining.
I want to buy new gaming/mining computer and I think about HD7950. Maybe then I could upgrade it to 2 HD7950.
How much Watt consumption should I assume for two graphics cards with AMD Phenom II processor?
I would like to mine when I do not use this computer.
You mention about mining LTC. Does this makes more sense?
Still too much of a newbie to really answer most of this question but I can tell you that my profits mining LTC are greater than mining BTC. In regards to GPUs I purchased HD7970s but if I had the chance to do it again I would purchase 7950s as the hashrates are similar (from what I'm told) but the cards are cheaper.
For power consumption I would just do the math - the specs are all available and accurate.
I hope I'm not violating any policies by posting this but I got my rig from ebay as a pre-built BTC/LTC mining rig. The machine was very well built and reasonably priced (less than I could build it for anyway - not to mention that I didn't have to spend time building it). As I mentioned previously if the machine pays for itself in a timely manner I'll consider it a smashing success.
http://www.ebay.com/itm/Bitcoin-Litecoin-Mining-PC-FX6300-2-x-HD7950-crossfire-Win7-Win8-8GB-RAM-650W/261216083769?ssPageName=WDVW&rd=1&ih=016&category=179&cmd=ViewItem
