Hi all, I recently got an asrock extreme 4 z77 mobo , intel 3570k and gskill 4gb x 2 1600MHZ(not dual channel, separate kit but same model, brought them together) I have update the mobo bios through internet There are four ram slots, and they are a1,a2,b1,b2 In manual its said that a1,b1LG011 and the X79 chipset brought a lot of good things powerful 6core CPUs, quad channel RAM, and 40 PCIe lanes Gigabyte's X79 line up consists of four motherboards;For more troubleshooting, refer to Gigabyte troubleshooting guide Note We have taken the following list from the Gigabyte Z390 Aorus Ultra manual These values probably mean the same for the other Z390 Aorus models, however I cannot confirm it since I don't have their manual Z390 Aorus Ultra debug LED codes Regular boot 10 PEI Core is started Gigabyte Ga Z170x Ud3 Rev 1 0 Lga 1151 Atx Intel Motherboard Newegg Com Gigabyte ga-z170x-ud3 error code 55