ive just bought 8gb of avexir DDR3 PC3-12800C9 1600MHz Dual Channel Memory 2x4gb sticks but my pc wont boot when i put both sticks in the same coloured slots on my board, i have to put 1 stick in the blue slot and one in the white for it to work but this is only giving me single channel mode,,, my motherboard is a gigabyte ga-ma790xt-ud4p with the latest bios version,, my 2x2gb sticks work fine in the same coloured slots running dual channel mode