Fatal1ty x399 won't post with 128GB RAM

wardog wrote: re: CMK128GX4M8B3000C16 I must ask. Is this a 128GB(16GBx8) Kit, or two 64GB(16GBx4) Kits? If indeed it is a 128GB Kit, check that ALL serial numbers are consecutive. The rest here assumes all 8 sticks are consecutively numbered !  If not post back, then contact the reseller or Corsair themselves Is this occurring before or after you set XMP? Describe please the method you are using to set XMP, as If you just booted into the BIOS. You don't say what GPU it is you have. One in particular drew(before a vBIOS update) an inordinate and out of spec power draw from the PCIe bus. Please post what GPU and also try plugging in/powering the 6-pin GFX_12V1 at the lower rt corner. Connecting GFX_12V1 would be all four MB power  connections: 4-pin(ATX12V2) , 8-pin(ATX12V1) , 24-pin(ATXPWR1) , and lastly 6-pin(GFX_12V1) Pull all the power connections and look at the mating M and F parts that the connectors are round and inserted to their proper depth in the M ends. I've seen on occasion where one has backed out and did not make proper contact with the F pin. Also look in the F connectors that the pins are centered. Seen this too where a pin was bent and not sliding into the M's round connector. This usually results in a connection that the M+F connection itself didn't allow for the connection securing clip on the M part to "snap' over and lock onto the F side. Look at ALL power connections that you didn't inadvertently not get all the M-F connections properly inserted and now have two or more pins not getting inserted into their correct contact. ie: powering air

Thanks for the response!  I'll try and respond to every point:

---->  If indeed it is a 128GB Kit, check that ALL serial numbers are consecutive.

Just took them all out, yes all sticks are numbered in perfect order.  Also they say this on the RAM:

CMK128GX4M8B3000C16
DDR4 128GB(8x16GB)
3000Mhz
16-18-18-36
1.35v
ver 5.39


---->   Is this occurring before or after you set XMP?

I can't get into the BIOS to set XMP with 8 sticks.

Instead, I can 1 to 7 sticks, enter the BIOS, change settings, save and exit and power off, then plug in the 8th stick, then power on.

I'm performing this exactly as I type it:

-- Remove all RAM sticks
-- Populate A2 B2 with 1 stick each
-- Power on and enter BIOS
-- F9 and reset bios to default.  Reboot. Enter into bios
-- Change XMP profile to XMP 2.0 Profile 1
-- Save and exit
-- Populate all 8 RAM sticks, reboot
-- System will not boot/POST, hangs on:  Dr. Error   C0    before rebooting


---> You don't say what GPU it is you have. One in particular drew(before a vBIOS update) an inordinate and out of spec power draw from the PCIe bus.

EVGA Geforce 1060 SC.  It has a 6 pin connector.  I've also tried with a secondary GTX970.  Both are the same.  I also tried plugging in the PCIe power into the motherboard.  All 4 power are filled.

SIDE NOTE:  This motherboard has a completely exposed PCIi power connector wiring right next to the motherboard reset/power on switches.  A finger needs to simply be off by less 1 inch before some serious hard to the end-user could occur.  Unlike the entirety of the rest of the mobo, this one has completely exposed power receptacles.

--> Pull all the power connections and look at the mating M and F parts

Done and no change.   It should be noted that this is my SECOND motherboard (returned the prior x399 Fatal1ty per Asrock recommendation) as well as my SECOND PSU (other was brand new as well).  New PSU was purchased on the side chance the CPU 2+2/4+4 power wasn't correct.



It almost looks as if the bios says this:  "Hmm, 8 sticks of RAM?  No post.  I don't care what settings just don't POST".

wardog wrote: When 8.1(Really? 8.1?) states this, did you prior confirm in the BIOS that all eight sticks were correctly enumerated there?

To clarify, 8.1 is NOT responsible for this behavior.

re: CMK128GX4M8B3000C16
I must ask. Is this a 128GB(16GBx8) Kit, or two 64GB(16GBx4) Kits?

If indeed it is a 128GB Kit, check that ALL serial numbers are consecutive.

The rest here assumes all 8 sticks are consecutively numbered !  If not post back, then contact the reseller or Corsair themselves

Is this occurring before or after you set XMP?
Describe please the method you are using to set XMP, as If you just booted into the BIOS.

You don't say what GPU it is you have. One in particular drew(before a vBIOS update) an inordinate and out of spec power draw from the PCIe bus.

Please post what GPU and also try plugging in/powering the 6-pin GFX_12V1 at the lower rt corner.
Connecting GFX_12V1 would be all four MB power  connections: 4-pin(ATX12V2) , 8-pin(ATX12V1) , 24-pin(ATXPWR1) , and lastly 6-pin(GFX_12V1)

Pull all the power connections and look at the mating M and F parts that the connectors are round and inserted to their proper depth in the M ends. I've seen on occasion where one has backed out and did not make proper contact with the F pin.

Also look in the F connectors that the pins are centered. Seen this too where a pin was bent and not sliding into the M's round connector. This usually results in a connection that the M+F connection itself didn't allow for the connection securing clip on the M part to "snap' over and lock onto the F side.

Look at ALL power connections that you didn't inadvertently not get all the M-F connections properly inserted and now have two or more pins not getting inserted into their correct contact. ie: powering air

Contact them again and direct them to this thread. You were likely told to RMA because one of the most common causes for issues like yours is a defective DIMM slot, with that ruled out they should be better able to assist you.

Xaltar wrote: I would open a support ticker with ASRock Tech Support. Based on your description it sounds like incompatibility. It technically could be the IMC on the CPU failing to operate with 8 populated dimm slots, it may be worth looking into voltages, you may need a little more to get 8 dimms to operate. Again though, Tech Support is who you want to ask, they will be by far better equipped to help you (they have access to your exact board model to test with).

I emailed their tech support.  They told me to return the motherboard.

So I did and bought a new one (same Fatal1ty x399).  It has the exact same issue.

I've changed voltages and reduced timing down to 1866 and still it won't boot.  7 sticks = POST.  8 sticks = no post.   :(