if i use anything other than stock settings and non xmp mode i get a loop of boot up for 5 seconds, shut down, boot up for 5 seconds, shut down, repeat for about 10 minutes and then it will finally boot up 100% stable, at literally any overclock other than stock. I dont think its a power issue, i was using a brand spankin new evga 1600w psu on the mobo+cpu, and had a ultra low power gpu plugged in. To get around it i would have to disconnect everything let it sit for a minute, hit clear CMOS then plug back in all the overclock settings, let it boot then shut down once, then it would boot correctly. This happened at 4.5ghz, 4.6ghz, 4.7ghz, 4.8ghz 4,9ghz and 5.0ghz using xmp profile for some gskill c9 2400mhz 8gb total ram, i didnt push farther than that because i was using the intel stock cooler for testing, temps were all fine, idle @ roughly 35c give or take a few degrees, voltages werent anything to insane for air cooling and just validating. I was going to pour ln2 on the board and chip but i didnt want to start until i figured out why it was taking me forever to get a successful boot. Using the launch build bios, havent touched it since my last post, been busy with my 4930k.
if you need anymore info Raja just let me know.