Can't load into Windows if I set proper RAM speed (Asus Rampage V extreme board)

[MegaTheJohny]

Hey guys,
I have problem setting up my RAM (G.Skill F4-2666C15Q-16GRR CL 15-15-15-35 1.2V) to 2666 MHZ.
Everything is working fine with ram speed 2133 Mhz, but as soon as I change RAM speed to 2666 Mhz inside the BIOS (version 0603, 2.9.2014) Windows can't load anymore. (Windows 8.1 64bit)
So do I have to update my bios? Because this memory model is compatible with my borad. Plz help

[Chino]

Yes, please update your motherboard BIOS to the latest revision. Use a freshly FAT32 formatted USB pendrive to put the BIOS file on and use the EZ Flash utility in the BIOS for the update.

[MegaTheJohny]

Thanks, after bios update everything was fine.

Just one more question. Why is Windows loading time so long with this board? (from the moment i press power button till I load to Windows, it takes about 38 seconds. My old pc loaded in like 23 sec or so. Faster loading is enabled in bios. Is there any way I can imporve this? There is very big gap from the moment I press Switch button till I see something on screen (screen is black for first 5-7 seconds).

[Chino]

The X99 platform is more complex so memory and PCIe training takes longer. It's normal.

[MegaTheJohny]

Just one more question. My old Asus board had Thermal Radar 2 for controlling temps and fan speed. I need similar program for my Asus Rampage V Extreme. Can you tell me what program should I get ? thanks

[Chino]

Look for the Fan Xpert 3 utility in the AI Suite 3 program.