i do mine with 2 hd 6990 from 2years more or less.. last claymore you can use is has you say 9.7 , you can mine all cryptonigth just set on the miner -allpool 1 for be able to set a different format wallet ( like yourwallet.worker/email)
msi afterburner , set it at 1065v 829mhz 1250 memory set (drow power will drop brutaly and you will still get 1465h/s)
for dont stress to much the power supply and make less noise for the fan i suggest you to plug external power supply for your 2° or 3° card has i did.. ( 1600 power supply are expensive.. instead you can use 2 old one..)
cheaper you go (buy well) , faster you will see your money return, in my case i buy everything 2° hand and i spend around 500 euro.. do your mat
