I brought a Gigabyte GA-990FXA-UD3 yesterday and also brought an AMD Phenom II X2 555 BE processor. I tried overclocking the processor, but I couldn’t achieve the full performance from it. I used this same processor in my old computer, but when overclocked, it would give me full performance. In Gigabyte GA-990FXA-UD3, when I use an overclocked processor, my system crashes and rebooting it takes more time than normal. I need to underclock it again to make it work normally. Also after overclocking, the values of VCore goes very high. I have updated BIOS in my system to its latest version, but it too doesn’t help. Can someone tell me why it is happening?