14900ks + apex encore + F5-6800J3445G32GX2-TZ5RK = unstable under XMP

[maorgr]

Hello, so my asus apex encore is completely unstable (won't boot) when applying the only F5-6800J3445G32GX2-TZ5RK Trident Z5 RGB DDR5-6800 CL34-45-45-108 64GB (2x32GB)
Intel XMP profile. Otherwise PC works fine. 14900KS is a golden chip.

MC score is 89

Am I missing something? I've been struggling with this for quite a while, so I would really be thankful for help.

BIOS is updated to the latest version.

Thanks for your time.

M

[emissary42]

Since the systems works at defaults and does not POST with the XMP, it sounds more like a configuration issue.

Troubleshooting options:

- typical order of stability: XMP II > XMP I > XMP Tweaked
- test both modules and DIMM slots individually, to rule out an issue with one of them
- try different BIOS versions, newer releases sometimes have different memory compatibility
- reseat CPU & cooler - uneven pressure or an overtightened cooler can impact memory overclocking
(also applies to contact frames, if not mounted correctly)
- configure the settings from the XMP manually and try reducing VCCSA (vs the auto value with the XMP is enabled)

[maorgr]

Since the systems works at defaults and does not POST with the XMP, it sounds more like a configuration issue.

Troubleshooting options:

- typical order of stability: XMP II > XMP I > XMP Tweaked
- test both modules and DIMM slots individually, to rule out an issue with one of them
- try different BIOS versions, newer releases sometimes have different memory compatibility
- reseat CPU & cooler - uneven pressure or an overtightened cooler can impact memory overclocking
(also applies to contact frames, if not mounted correctly)
- configure the settings from the XMP manually and try reducing VCCSA (vs the auto value with the XMP is enabled)

I've tried reseating the CPU and Cooler (arctic 420 freezer III)
VCCSA = 1.2v
Any specific recommended values that I should enter? what about MC,vdd and vddq voltages recommended values ?

[maorgr]

?

[emissary42]

Manually adjusting voltages like VCCSA comes down to your specific CPU. So there is no universal "right" value. You just do small adjustments and look for improvements. You shouldn't have to touch the other voltages, unless you want to go the full manual route.

Before that: How did the individual testing of both modules and slots go? Did no combination work at all, even with XMP II?

[selim]

Motherboard : ASUS ROG MAXIMUS Z790 APEX ENCORE

processor : İNTEL I9 14900 KS

Memory (RAM): G.SKILL F5-8400J4052G24GX2-TR5S

Trident z5 Royal DDR5 -8400CL40-52-52-134

1.40V

48GB (2X24GB) İntel XMP

BIOS updated to latest version.

System Unstable under XMP. blue screen error while booting .There is no problem when the system runs on default settings.

According to the test results, the memories are OK .. No problem.

As a result, the memories do not work in xmp mode.. The system works fine in default mode (5600 mhz)

It works fine in xmp mode with other brand memories.

We have done many tests but we could not get a positive result. We need help.

[GSKILL TECH]

selim Try one memory module at a time to see if each can be stable with XMP Profile. With both installed, test to see what is the highest DRAM Frequency that can be stable.

[selim]

selim Try one memory module at a time to see if each can be stable with XMP Profile. With both installed, test to see what is the highest DRAM Frequency that can be stable.

Thanks for your answer. This method worked. The memory alone works great..The other one is working great too.. It turned out that they were incompatible with each other.