Asrock x99 Extreme11 unstable

[Matteo Pastorino]

Hi all,


I'm having a lot of problems with this mainboard. I tryied upgrading the bios from 3.0 to 3.20 but it doesn't work.
The os is unstable, it freezes and reboots. Now I am on win 10 but I tried win 7 too.


Somethimes when the system reboots it stucks at boot with a code error ( 94 or 95 ) .


The system is quiet stable using just three video cards in PCIE 1/2/5.
If I try to use the PCIE 3 or 4 it turns unstable again. It looks like the PCIE doesn't work correctly.


Is there a bios update or a bios setting I should change to fix this or I should go for RMA?






here is my system:


MB: Asrock x99 Extreme11
CPU: i7-6850k
Ram: Corsair CMD32GX4M2C3200C16 2*16GB
Video: 4x pny gtx 1080 founders edition
Os: Win 10 ( fully updated )
Video Drivers: 372.90 whql

[ASRock TSD-Michael]

Re: Asrock x99 Extreme11 unstable

Dear Matteo,
This is Michael from ASRock Technical support Team.

We provide following suggestions for you to try:
1. Please connect a 4 pin molex power cable to PCIe Power Connectors when more than three graphics cards are installed.
The location of PCIe Power Connectors(see Page 30):

http://asrock.pc.cdn.bitgravity.com/Manual/X99%20Extreme11.pdf

2. Load BIOS to default setting to try.
3. Only install one stick memory on each DIMM slots by turns.
4. Confirm that four VGA cards are installed (PCIE1) / (PCIE2) / (PCIE4) / (PCIE5)
5. Update BIOS to P3.20
Please follow the steps and refer the link to flash BIOS P3.20:
Link: ASRock - BIOS Upgrade Instruction
Step1: Please make a bootable USB device in the first step, and the USB format should be FAT32.
Step2: Please download [Instant Flash] BIOS P3.20 from following link:
http://www.asrock.com/mb/Intel/X99%20Extreme11/?cat=Download&os=BIOS
Step3: Unzip the file and save ROM file in root directory of bootable USB device.
Step4: Enter BIOS > Tool > Press [instant fresh] ( Press [Del] in post screen )
Step5: During BIOS updating, do not plug off the power.
Step6: After finishing the process, please enter the main page of BIOS to check BIOS version.

6. If possible, change another power supply.


Thank you!

Have a great day,
ASRock TSD-Michael