X370 Killer SLI bios 4.50 failed to boot with 64GB

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   I have a X370 Killer SLI motherboard installed with 4 pcs of Apacer 16GB 2400 RAM.  The previous BIOS version was 3.40.  The CPU is AMD Ryzen 1700.  The system works ok most of the time except a case: The system will hang after working for few weeks. I have no clue yet whether it is software or hardware issue.
I upgrade the BIOS to 3.50,  the system can boot.  I continue upgrade 4.50, the system can't boot.  After some trial and error, I remove 2 pcs of RAM from the motherboard, the system can boot again.  I plug the 2 pcs RAM back to motherboard, the system can't boot.

I downgrade the BIOS to 3.50 with 4 pcs RAM installed, the system can boot and works again.

Is this a problem with latest 4.50?

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ccy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Jan 2018 Status: Offline Points: 7	Post Options Post Reply Quote ccy Report Post Thanks(0) Quote Reply Topic: X370 Killer SLI bios 4.50 failed to boot with 64GB Posted: 30 Jan 2018 at 9:19am
	I have a X370 Killer SLI motherboard installed with 4 pcs of Apacer 16GB 2400 RAM. The previous BIOS version was 3.40. The CPU is AMD Ryzen 1700. The system works ok most of the time except a case: The system will hang after working for few weeks. I have no clue yet whether it is software or hardware issue. I upgrade the BIOS to 3.50, the system can boot. I continue upgrade 4.50, the system can't boot. After some trial and error, I remove 2 pcs of RAM from the motherboard, the system can boot again. I plug the 2 pcs RAM back to motherboard, the system can't boot. I downgrade the BIOS to 3.50 with 4 pcs RAM installed, the system can boot and works again. Is this a problem with latest 4.50?

Icreatin Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Jan 2018 Location: Canada Status: Offline Points: 1	Post Options Post Reply Quote Icreatin Report Post Thanks(0) Quote Reply Posted: 30 Jan 2018 at 10:56pm
	I just updated to 4.50 from 3.50 and now am stuck at the post screen and cannot get into uefi all I can do is restart the system. Changing the ram doesn't matter I just can't get into uefi. System Cpu: A8-9600 Ram: 2x 8g corsair vengeance (a2+b2) Gpu: Gtx 660 Psu: Cs650m Hdd: random SATA drive OS: Win 10 pro

ccy Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 30 Jan 2018 Status: Offline Points: 7	Post Options Post Reply Quote ccy Report Post Thanks(0) Quote Reply Posted: 14 Jan 2019 at 9:18am
	I upgrade bios to version 5.10 dated 21 Dec 2018 on the same X370 Killer SLI motherboard. Again, the system fail to boot. I have 4x 16GB DDR4 Apacer 2400 installed. I remove one of the RAM and the system can boot with 3x 16GB ram. I re-plug RAM and try boot with 4x 16GB, it won't boot. I go into BIOS setting and change the RAM frequency from Auto (2400Mhz) to 2133MHz. The system can boot with 4x16GB again. I am not sure if this the RAM issue or BIOS firmware issue. The same hardware configuration works with BIOS version 3.50 on 4x16GB 2400MHz but won't work with 5.10.