z77 slotThe ram slots are 1 & 3 or 2 & 4 on dual channel boards. You can also watch the boot up from the power on, {turning off boot logo in the bios}. Or usingThis guide covers UEFI tuning for ASUS Z77 motherboards, including P8Z77 series, Sabertooth Z77 and Republic of Gamers Maximus V series.