I was getting some random errors with prime and orthos, I thought it was my CPU overclock or FSB.
At the end I discover it was the RAM. My Axeram 800 doesn't like 1080 with 5-5-5-15.
I had to change my setup for 400*9 with RAM at 1000 to get it stable with 2.1V.
It is a great deal but I think I got a bad batch.
Did you guys notice that the heatspreaders are not well placed? They don't touch every chip, I had to take them off and put it again with pressure over specific points.