I bought some Gskill sniper 16gb 8x2 model number f3-1600c9d-16gsr ddr3-1600 pc3-12800 . It wont run in dual channel mode, but runs fine In single channel mode. I have an asus P8Z77-V LK. I've tried both slots only 1 stick, all 4 slots every configuration possilbe, but it will only run in single channel. Is there a known compatibility problem with these sticks and this mobo? Are 8x2 generally a bad idea? Ty ahead of time.