Thanks, i try it, but do not help me 
Hash.Type......: WPA/WPA2
Speed.GPU.#1...: 140.9 kH/s
Speed.GPU.#2...: 166.3 kH/s
Speed.GPU.#*...: 307.3 kH/s
Fan speed has increase, hash speed increase, but still very different
hm... maybe videocard is different revision... i check it.
However, i buy both in one day and exactly same model.
When card is overclock +100Mhz, it works stable in 24/7? i think it's not good idea, for very high load in long time, or not?
Hash.Type......: WPA/WPA2
Speed.GPU.#1...: 140.9 kH/s
Speed.GPU.#2...: 166.3 kH/s
Speed.GPU.#*...: 307.3 kH/s
Fan speed has increase, hash speed increase, but still very different
hm... maybe videocard is different revision... i check it.
However, i buy both in one day and exactly same model.
When card is overclock +100Mhz, it works stable in 24/7? i think it's not good idea, for very high load in long time, or not?