Fatal1ty x399 won't post with 128GB RAM

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   UPDATE:  The following occurs (and is repeatable)

If I have 7 sticks of ram (to get it to post) and update to 1.5 bios
Then reboot, clear settings, update to 1.3 bios, power down
Then plug in 8th stick of ram
Then power back on...
... the system will boot into Windows 8.1

HOWEVER

Windows 8.1 will say there is 32GB of RAM usable and 96GB as "Hardware Reserved".

If I reboot then the system will never post again with a C0 error. 

Something is really messed up.  Again, this is the second x399 board.

It is as if this RAM isn't working correctly with this mobo, yet I know the RAM works fine as 4 sticks works just fine in all combinations of slots + RAM sticks.

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128noGB Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Sep 2017 Status: Offline Points: 33	Post Options Post Reply Quote 128noGB Report Post Thanks(0) Quote Reply Posted: 29 Sep 2017 at 2:27pm
	UPDATE: The following occurs (and is repeatable) If I have 7 sticks of ram (to get it to post) and update to 1.5 bios Then reboot, clear settings, update to 1.3 bios, power down Then plug in 8th stick of ram Then power back on... ... the system will boot into Windows 8.1 HOWEVER Windows 8.1 will say there is 32GB of RAM usable and 96GB as "Hardware Reserved". If I reboot then the system will never post again with a C0 error. Something is really messed up. Again, this is the second x399 board. It is as if this RAM isn't working correctly with this mobo, yet I know the RAM works fine as 4 sticks works just fine in all combinations of slots + RAM sticks.

128noGB Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Sep 2017 Status: Offline Points: 33	Post Options Post Reply Quote 128noGB Report Post Thanks(0) Quote Reply Posted: 29 Sep 2017 at 2:12pm
	OP here. Some more details: With 4x sticks of RAM, everything works fine, Windows loads, everything runs, no crashes, etc. So the CPU seems to be fine. The mobo has the 2x2 CPU power + the 4x4 CPU power connector both plugged in. The 2x2 is using a split 4x4 power cable and the 4x4 is using the normal power cable. All is good. Plus I tried a different power supply. The mobo does not have the PCIe extra power connector as its not needed.

128noGB Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 29 Sep 2017 Status: Offline Points: 33	Post Options Post Reply Quote 128noGB Report Post Thanks(0) Quote Reply Posted: 29 Sep 2017 at 2:08pm
	Hello, I've been direly trying to get this to work and so far nothing is working right. Here is the problem: My x399 Fatal1ty motherboard will not post when I have all 8x16GB (128GB) sticks of RAM in it. The Dr. code thingy shows this error: C0 SPECS: Mobo: Fatal1ty x399 Motherboard CPU: Threadripper 1950x RAM: 128GB of CMK128GX4M8B3000C16 CORSAIR Vengeance LPX 128GB (8 x 16GB) 288-Pin DDR4 SDRAM DDR4 3000 (PC4 24000) (on the QVL) PSU: Corsair RM1000x GPU: GTX 1060 DETAILS: If I put 8x RAM sticks, it will not post. If I put 1 to 7 RAM sticks in, it posts. I have tried ALL ram slot combinations. They all work. I have tried ALL ram sticks. They all work. I have got a brand new x399 Fatal1ty motherboard. Still has the same problem. Problem exists in bios 1.3 Problem exists in bios 1.5 I've tried multiple PSU. All work fine. I've tried multiple GPU. All work fine. CPU looks just fine (no scarring of the plate, brand new). The issue literally is the 8th stick of RAM causes the system not to boot. That's it. I've tried changing a few things in the bios and nothing matters. I've reset CMOS and that changes nothing. If I put 4 sticks of RAM in, it boots just fine, installs Win, etc. I've tried all various RAM slots and they all work. All RAM sticks work as well. I absolutely must get all 128GB to work. Does anybody have any ideas what to do? I can't think of anything else to try.