F5F Stay Refreshed Hardware Desktop Bios problem - 8400 mt/s RAM, 14900KS CPU?

Bios problem - 8400 mt/s RAM, 14900KS CPU?

Bios problem - 8400 mt/s RAM, 14900KS CPU?

J
jjsoini
Posting Freak
809
02-02-2023, 04:50 AM
#1
I’m running into a major issue with my new high-end PC and I really need help.
I recently built a system using some of the fastest consumer hardware available. After installing all the components and setting BIOS to default, I noticed in \*\*Task Manager\*\* that my RAM was only running at \*\*5700 MT/s\*\*, far below the rated \*\*8400 MT/s\*\*.
After researching, I learned I need to enable \*\*XMP II\*\* to run the kit at 8400. So I went into BIOS, selected \*\*XMP II\*\*, and set the DRAM frequency to 8400.
\*\*That’s when the problems started.\*\*
My PC would not boot. Instead, I got a repeating cycle:
\* black screen
\* restart
\* black screen
\* restart
\* eventually an error that forced me back into BIOS
\* exiting BIOS then allowed Windows to load normally
So Windows worked, but \*\*memory training failed every single boot\*\*.
After a week of constant retraining loops, I lowered the memory to \*\*7600 MT/s\*\*.
This allowed the PC to boot, but I started getting frequent crashes and blue screens.
\### \*\*BSOD Errors I received:\*\*
\* KMODE_EXCEPTION_NOT_HANDLED
\* MEMORY_MANAGEMENT (0x1A)
\* IRQL_NOT_LESS_OR_EQUAL
\### \*\*Reported drivers causing crashes:\*\*
\* ntoskrnl.exe
\* nvlddmkm.sys
\* dxgmms2.sys
After that, I lowered the RAM to \*\*7200 MT/s\*\*, and the system has been \*\*completely stable for a full week\*\*. No crashes, no BSODs. So 7200 seems to be the stable point.
From the research I’ve done, it seems that running \*\*8400 MT/s\*\* usually requires adjusting the following voltages:
\* \*\*VDD\*\*
\* \*\*VDDQ\*\*
\* \*\*TX VDDQ\*\*
However, the two most important voltages for high-speed DDR5 — \*\*SA (System Agent)\*\* and \*\*IMC (Integrated Memory Controller)\*\* — are \*\*locked\*\* on my motherboard. In BIOS, they’re grayed out:
\* SA = \*\*1.25 V\*\* (locked)
\* IMC = \*\*1.30 V\*\* (locked)
Everything I’ve read says:
\* If \*\*SA/IMC voltages are too low\*\*, the PC will fail memory training → black screen loops
\* Extremely high-speed kits like \*\*8400 MT/s\*\* almost always require raising SA/IMC
\* If these two voltages cannot be adjusted, hitting 8400 is “nearly impossible”
\### \*\*Additional questions:\*\*
1\. \*\*Can someone confirm whether locked SA/IMC voltages are the reason my system cannot train at 8400 MT/s?\*\*
2\. \*\*Is there any way to unlock SA and IMC voltage control on the ASUS ROG STRIX Z790-E GAMING WIFI II?\*\*
3\. \*\*If I could adjust SA/IMC, would this realistically allow the system to boot at 8400?\*\*
4\. Has anyone else with very high-speed DDR5 kits experienced this?
5\. \*\*Is it true that 24 GB kits may be harder to run at 8400 MT/s compared to 16 GB kits?\*\* If so, does that make achieving 8400 MT/s more like a “lottery” in my case, or is it unrelated?
This issue seems rare because not many people run 8000+ MHz kits, and I can’t find solid answers. Any help would be appreciated.
\---
\## \*\*💻 My Full PC Specs\*\*
\* \*\*Monitor:\*\* ASUS ROG Swift OLED PG27AQDP — 1440p, 480 Hz
\* \*\*CPU:\*\* Intel Core i9-14900KS
\* \*\*GPU:\*\* Zotac RTX 5080 OC
\* \*\*RAM:\*\* G.Skill Trident Z DDR5 8400 MHz, 24 GB kit
\* \*\*Motherboard:\*\* ASUS ROG STRIX Z790-E GAMING WIFI II
\* \*\*Cooling:\*\* Corsair Titan RX 360 AIO
\* \*\*Storage:\*\* Crucial T705 2TB PCIe Gen5 NVMe M.2 SSD (with heatsink)
\* \*\*Operating System:\*\* Windows 11
NB: IF my pc was not able to boot on 8400 it seem to be a lack of low voltages because after failing 3 to 4 times to boot and gets me to bios then exit to windows , windows works tottaly fine fornmany days with no issue , seem to be a boot volatges maybe from imc and sa im lost
J
jjsoini
02-02-2023, 04:50 AM #1

I’m running into a major issue with my new high-end PC and I really need help.
I recently built a system using some of the fastest consumer hardware available. After installing all the components and setting BIOS to default, I noticed in \*\*Task Manager\*\* that my RAM was only running at \*\*5700 MT/s\*\*, far below the rated \*\*8400 MT/s\*\*.
After researching, I learned I need to enable \*\*XMP II\*\* to run the kit at 8400. So I went into BIOS, selected \*\*XMP II\*\*, and set the DRAM frequency to 8400.
\*\*That’s when the problems started.\*\*
My PC would not boot. Instead, I got a repeating cycle:
\* black screen
\* restart
\* black screen
\* restart
\* eventually an error that forced me back into BIOS
\* exiting BIOS then allowed Windows to load normally
So Windows worked, but \*\*memory training failed every single boot\*\*.
After a week of constant retraining loops, I lowered the memory to \*\*7600 MT/s\*\*.
This allowed the PC to boot, but I started getting frequent crashes and blue screens.
\### \*\*BSOD Errors I received:\*\*
\* KMODE_EXCEPTION_NOT_HANDLED
\* MEMORY_MANAGEMENT (0x1A)
\* IRQL_NOT_LESS_OR_EQUAL
\### \*\*Reported drivers causing crashes:\*\*
\* ntoskrnl.exe
\* nvlddmkm.sys
\* dxgmms2.sys
After that, I lowered the RAM to \*\*7200 MT/s\*\*, and the system has been \*\*completely stable for a full week\*\*. No crashes, no BSODs. So 7200 seems to be the stable point.
From the research I’ve done, it seems that running \*\*8400 MT/s\*\* usually requires adjusting the following voltages:
\* \*\*VDD\*\*
\* \*\*VDDQ\*\*
\* \*\*TX VDDQ\*\*
However, the two most important voltages for high-speed DDR5 — \*\*SA (System Agent)\*\* and \*\*IMC (Integrated Memory Controller)\*\* — are \*\*locked\*\* on my motherboard. In BIOS, they’re grayed out:
\* SA = \*\*1.25 V\*\* (locked)
\* IMC = \*\*1.30 V\*\* (locked)
Everything I’ve read says:
\* If \*\*SA/IMC voltages are too low\*\*, the PC will fail memory training → black screen loops
\* Extremely high-speed kits like \*\*8400 MT/s\*\* almost always require raising SA/IMC
\* If these two voltages cannot be adjusted, hitting 8400 is “nearly impossible”
\### \*\*Additional questions:\*\*
1\. \*\*Can someone confirm whether locked SA/IMC voltages are the reason my system cannot train at 8400 MT/s?\*\*
2\. \*\*Is there any way to unlock SA and IMC voltage control on the ASUS ROG STRIX Z790-E GAMING WIFI II?\*\*
3\. \*\*If I could adjust SA/IMC, would this realistically allow the system to boot at 8400?\*\*
4\. Has anyone else with very high-speed DDR5 kits experienced this?
5\. \*\*Is it true that 24 GB kits may be harder to run at 8400 MT/s compared to 16 GB kits?\*\* If so, does that make achieving 8400 MT/s more like a “lottery” in my case, or is it unrelated?
This issue seems rare because not many people run 8000+ MHz kits, and I can’t find solid answers. Any help would be appreciated.
\---
\## \*\*💻 My Full PC Specs\*\*
\* \*\*Monitor:\*\* ASUS ROG Swift OLED PG27AQDP — 1440p, 480 Hz
\* \*\*CPU:\*\* Intel Core i9-14900KS
\* \*\*GPU:\*\* Zotac RTX 5080 OC
\* \*\*RAM:\*\* G.Skill Trident Z DDR5 8400 MHz, 24 GB kit
\* \*\*Motherboard:\*\* ASUS ROG STRIX Z790-E GAMING WIFI II
\* \*\*Cooling:\*\* Corsair Titan RX 360 AIO
\* \*\*Storage:\*\* Crucial T705 2TB PCIe Gen5 NVMe M.2 SSD (with heatsink)
\* \*\*Operating System:\*\* Windows 11
NB: IF my pc was not able to boot on 8400 it seem to be a lack of low voltages because after failing 3 to 4 times to boot and gets me to bios then exit to windows , windows works tottaly fine fornmany days with no issue , seem to be a boot volatges maybe from imc and sa im lost

F
Frostedtiger04
Junior Member
21
02-02-2023, 07:15 AM
#2
Participate in the lottery to ensure your RAM meets advertised performance. Choose the exact RAM model from MoBo memory QVL, using this link:
https://rog.asus.com/motherboards/rog-st...vl_memory/
After reviewing, Asus has not achieved any RAM exceeding 8000 MT/s. Your chances depend on the lottery outcome.
F
Frostedtiger04
02-02-2023, 07:15 AM #2

Participate in the lottery to ensure your RAM meets advertised performance. Choose the exact RAM model from MoBo memory QVL, using this link:
https://rog.asus.com/motherboards/rog-st...vl_memory/
After reviewing, Asus has not achieved any RAM exceeding 8000 MT/s. Your chances depend on the lottery outcome.

_
_K03N_
Junior Member
17
02-08-2023, 12:27 PM
#3
I understand. The system should handle 8k automatically without needing manual setup for SA/IMC.
_
_K03N_
02-08-2023, 12:27 PM #3

I understand. The system should handle 8k automatically without needing manual setup for SA/IMC.

J
juri1990
Senior Member
441
02-08-2023, 06:12 PM
#4
If you receive the exact RAM specified in MoBo memory QVL, simply activate the built-in XMP profile and you're ready to proceed. However, if the RAM isn't listed (or is listed but with slower transfer rates), the RAM lottery starts anew, and you must manually configure it by adjusting its timings and voltage. On Auto mode, RAM typically operates at JEDEC speeds ranging from 4000 to 4800 MT/s.
J
juri1990
02-08-2023, 06:12 PM #4

If you receive the exact RAM specified in MoBo memory QVL, simply activate the built-in XMP profile and you're ready to proceed. However, if the RAM isn't listed (or is listed but with slower transfer rates), the RAM lottery starts anew, and you must manually configure it by adjusting its timings and voltage. On Auto mode, RAM typically operates at JEDEC speeds ranging from 4000 to 4800 MT/s.