I have enabled crossfiere it seems to be better now, more fps lower is 32 fps in World of tanks. Average is 32-80. But , when I enable it in bios, I put Frame bufer Size 1Gb, should I put it 2GB? becouse ram on asus is 2Gb? or I am wrong?
Yes, I would buy an aftermarket cooler. A coolermaster hyper TX3 is a decent budget cooler and far better than stock. A T4 is another that would work. Both use the stock AMD mounting system on the motherboard, so you will not have to remove your motherboard to install. Just be aware of the CPU cooler height your case can support.