Unsupported MT/s speed for Memory

[Manuel_Ferrante]

Hello,

i have made a Memory upgade to my product above to this: Kingston Memory Technology FURY Beast 128 GB 5200 MT/s DDR5 CL40 DIMM (Kit da 4 moduli) RGB XMP [KF552C40BBAK4-128] .   

Here link product i have bought: https://www.sferaufficio.com/articolo/kingston-technology-fury-beast-128-gb-5200-mt-s-ddr5-cl40-dimm...

Main problem is that my memory is running to 3600 MT/s and not to the referral speed of 5200 MT/s supported.

I have tried too opening Bios settings, XMP and setting manually MT/s to 5200 but when i restart pc i can't have Display working: black screen and different Audio Beeps and pc restartings after that Bios reset MT/s to 3600.

Could be a Bios bug ?   I'm running latest F.31 Rev.A update for my product S/N:  8CG3382CKQ   so maybe Bios need some upgrade from you to fix this MT/s problem that won't let me use referarral memory speed to 5200.

This is my maiboard:  https://support.hp.com/us-en/document/ish_7102302-7102365-16

Please Help me.

Manuel 

[NonSequitur777 · Accepted solution]

@Manuel_Ferrante,

Welcome to our HP Community forum!

Yours is an interesting issue.  The 4x32GB KF552C40BBAK4-128 RAM kit should run at least at the 4800 MHz default (SPD) speed, as per: https://www.kingston.com/datasheets/KF552C40BBAK4-128.pdf.

It is not clear to me how you would go about getting your RAM to run at 5200 MHz -or even 6000 MHz as some HP System OMEN by HP 45L Gaming Desktop GT22-1xxx Users have been able to: https://www.userbenchmark.com/System/HP-OMEN-by-HP-45L-Gaming-Desktop-GT22-1xxx/292265.

Nevertheless, let’s go over what’s happening and how to fix it.

Why Is Your RAM Running at 3600 MT/s?

1. Motherboard & BIOS Limitations

   • The ArcticOC (8A96) motherboard officially supports up to DDR5-5200 MT/s, but only under optimal conditions.
   • Using 4 DIMMs (4x32GB) increases the load on the memory controller, which often forces the system to downclock the RAM for stability.
   • The BIOS likely defaults to JEDEC 3600 MT/s when it detects four modules to ensure system stability.

2. XMP Profile Not Holding at 5200 MT/s

   • The system is trying to apply the XMP profile, but the increased stress of 4 DIMMs may be causing instability, forcing the BIOS to reset.
   • The fact that you hear beeps and auto-restarts suggests a memory training failure, which happens when the motherboard and CPU memory controller can’t run the RAM at the selected speed.

 

Troubleshooting & Fixes:

1. Try Enabling XMP Again with Lower Speed:

• Enter BIOS (F10 at startup).
• Navigate to Advanced > Overclocking Settings (if available).
• Ensure XMP is enabled (try XMP 1 and XMP 2 if both options exist).
• Instead of setting 5200 MT/s, try 4800 MT/s first.
• If 4800 MT/s works, then the issue is stability at higher speeds.

 

2. Increase Memory Voltage (If Option Exists in your BIOS) :

• Some DDR5 kits require 1.25V to 1.35V for stability at higher speeds.
• If your BIOS allows it, manually set the memory voltage to 1.25V or 1.35V (depending on the RAM specs).

 

3. Test with Only 2 DIMMs Installed:

• Try removing 2 of the 4 sticks, leaving only 2x32GB installed.
• If the system allows 5200 MT/s with only 2 sticks, then the limitation is due to running 4 DIMMs.
• This would confirm that the issue is with the memory controller handling a full 128GB at high speeds.

 

4. Manually Set a Stable Frequency:

• If 5200 MT/s keeps failing, try manually setting the RAM to 4800 MT/s.
• If that fails, drop to 4400 MT/s, and so on, until you find a stable speed.

 

Is This a BIOS Bug?

Your BIOS version (F.31 Rev.A) is the latest, so this is likely not a bug but a hardware/firmware limitation.

• HP’s ArcticOC motherboard might not fully support 4x32GB DDR5 at 5200 MT/s, even if the chipset does.
• Future BIOS updates could improve compatibility, but HP typically locks down advanced overclocking options.

 

Final Recommendations:

• Try running at 4800 MT/s instead of 5200.
• Check if 2 DIMMs work at full speed—this helps confirm if the issue is due to 4-DIMM configurations.
• Monitor HP’s support page for any future BIOS updates that might improve memory support.

Kind Regards,

NonSequitur777

[Manuel_Ferrante]

Thanks for the help.

I have tried to set it on the Bios to 4800 and 4400 both and it works, i can have system running and confirmed too MT/S speed on the Task Manager.

Now the only problem is that when i power-on PC it makes 1 minute to give me display working and running OS.    Only 5 seconds by using 3600 MT/s automatic value instead.

[NonSequitur777]

@Manuel_Ferrante,

Thanks for the update! Based on your observations, here is what I believe is happening:

Why Is Boot Time Longer at Higher RAM Speeds?

✅When you manually set the RAM to 4400MT/s or 4800MT/s, your system likely performs so-called memory training on every cold boot, which can take longer.
✅At 3600MT/s (default automatic setting), the system doesn’t need extensive training, so it boots quickly (~5 seconds).
✅This behavior is common on DDR5 memory, especially with higher-capacity kits like 128GB (4x32GB), as they put more strain on the memory controller.

---

Possible Fixes & Optimizations:

🔹1. Enable "Memory Fast Boot" in BIOS (if available) :

• This skips full memory training on every boot, significantly reducing startup time.
• Check under Advanced Memory Settings or a similar section in the BIOS.

🔹2. Try Setting XMP at 4800MT/s With Slightly Higher Voltage (if available) :

• Sometimes increasing VDD/VDDQ (Memory Voltage) slightly (e.g., from 1.25V to 1.3V) helps stabilize higher speeds.
• If BIOS allows it, adjust System Agent (SA) Voltage slightly higher to help with memory stability.

🔹3. Check If BIOS Version F.31 Has "Memory Training Persistence" Option:

• Some BIOS versions allow you to train memory once and save the settings, avoiding long boot times on every restart.
• If unavailable, HP might need to release an update to improve memory handling.

🔹4. Consider Running at 4400MT/s If 4800MT/s Takes Too Long:

• If 4400MT/s is stable and fast enough for your needs, it might be the best balance between speed and boot time.

---

Final Thoughts:

• Your system is working correctly, but DDR5 memory training is causing the delay at higher speeds.
• Try enabling "Memory Fast Boot" or slightly increasing voltage to stabilize 4800MT/s (if available).
• If no fix is found, HP may need a BIOS update to optimize memory training for high-capacity kits.

Kind Regards,

NonSequitur777

[Manuel_Ferrante]

Thanks for your time Mate.

I think HP may need a BIOS update to optimize memory training for high-capacity kits.

1. Memory Fast Boot option it doesn't exist

2. Memory Training Persistence it doesn't exist

Hope HP updates quickly the Bios on this environment

[NonSequitur777]

@Manuel_Ferrante,

I was afraid so...

Best you can do is to check the BIOS/driver link occasionally to see if there is a new BIOS upgrade made available.

Kind Regards,

NonSequitur777