i think I've finally figured it out!! the MB has 2 12v slots. one 8 pin and a 4 pin. i managed to call gigabyte and ask them if its ok to plug it in and they said yes do it, it improves stability. and they said if you do OC to the cpu leave the CPU voltage on auto. since i did that its loads better!! i'll be another couple of days of running it till i'm 100% sure its fixed so i'll be back to let you all know