Asus Rampage V extreme cannot boot

[Ralf111]

Hi to everyone,i have problem with my new build PC it work fine for last 3 weeks and today after i restarted it want boot anymore.
Red led cpu flash and i have error code on motherboard AF,i tried already remove all ram sticks then just leave one of them but this doesn't help also
clearing CMOS and removing battery not help at all.i can't go into bios to change it into default settings.


Pc spec
Intel 5960x
Asus rampage v extreme
Psu 1000w gold power supply
Ram corsair dominator platinum 16gb
Cooler master Nepton 280L

[Boofster]

Have you found any further solutions to this?

Mine also worked perfectly for months and all of a sudden stuck at AF after a reboot.

[ejlover]

I'm having the same issue for last 4 months. I've the system written below for about 6 months. I've never experienced this problem for the first few weeks than I've adjusted RAMs to work at 2666. After a while this boot problem started in about a month. I thought it may be because of the RAM adjustments. I've began to use the standard settings after that. But the problem started again a month ago. And now I can't boot the PC at first try. Some times it boots on the 4th try but sometimes it takes 20 tries. BIOS is flashed to latest version and PC is connected to a TV via HDMI port.

Intel i7 5960X
32GB Kingston HyperX Predator DDR 2800MHz / CL14 1.35V
ASUS Nvidia GTX TITAN X
Corsair H100i cooler
Corsair HX1000i 1000W PSU
with Kingston 480GB HyperX Predator PCIe X4 M.2 SSD


ASUS should solve this problem soon. This situation effects my work and causes delays..

[Chino]

ejlover wrote:

32GB Kingston HyperX Predator DDR 2800MHz / CL14 1.35V

What is the exact model of your memory kit?

And does this problem happen with RAM at stock defaults (2133MHz)?

[Boofster]

I seem to have fixed it for now by switching from 125 BCLK to 100. I have 3000 RAM. Working great. My boot voltage for RAM is 1.375 and my eventual is 1.355 (all 8 slots occupied).

Oh and I managed to get to the BIOS after leaving the system off overnight.

[ejlover]

Chino wrote:
What is the exact model of your memory kit?

And does this problem happen with RAM at stock defaults (2133MHz)?

That was the actual model of the RAM. Kingston HyperX predator 4x8GB 2800 CL14. That's all written on its name.

This happens now at 2133 but it also happened many times before on 2800 and 2666. I'm sure this issue is completely MoBo related and needs a fix immediately.