cancel
Showing results for 
Search instead for 
Did you mean: 

G.Skill 8400MHz Royal Issue

marios50
Level 7

Hi everyone


I recently purchased a kit of F5-8400J4052G24GX2-TR5G, 8400MHz RAM Speed, CAS 40-52-52-135 Timings, 1.40v VDIMM.

I am using this with a Z790 ASUS Apex Encore board which is listed in the QVL for this kit along with a 14900KS CPU with a MC SP-rating of 84.

However, I cannot get this kit stable at all using the XMP kit in XMP I or XMP II. Games crash and overall stability is not there. Memtest86 fails with multiple errors.

 Are there any specific changes to voltages/settings you guys would recommend to try or do I have a faulty kit?

Thanks!

288 Views
11 REPLIES 11

Nate152
Moderator

Hello marios50

The higher speed/capacity you go, the more X.M.P. becomes hit or miss. This most likely is your cpu memory controller struggling with stability. In which case, you have three options to try and achieve stability.

1) Lower the Dram Frequency

2) Loosen the timings

3) Manually tune voltages

There are five voltages that will help stabilize your high speed DDR5 memory:

1) Dram VDD voltage

2) Dram VDDQ voltage

3) Cpu System Agent voltage

4) IVR Transmitter VDDQ voltage

5) Memory Controller voltage

Before recommending any voltage changes, can you post a screenshot of the the HWinfo Sensors tab?

This is a free monitoring program for your pc. Under Installer, click free download in green. - Free Download HWiNFO Sofware | Installer & Portable for Windows, DOS

Once on the Sensors page, click the arrows at the bottom left to expand all readings.

Here is an example of mine, click the pic to make it bigger.

HWinfo.png

 

 

 

 

Hi, thanks for the reply. I've attached the photo. I already tried increasing some voltages but it didn't help, perhaps I increased the wrong ones or by too much. Feel free to let me know what to try.

Screenshot 2025-01-13 212633.png

Nate152
Moderator

I see you must have enabled High Dram Voltage Mode in the bios as your Dram VDD voltage is at 1.53v and Dram VDDQ voltage is at 1.60v, this is pretty high voltage.

Although they are high, your Dram temperature looks good.

1) Try bumping up the Memory Controller voltage to 1.45v.

2) Try bumping up the IVR Transmitter VDDQ voltage to 1.40v.

3) Try bumping up the CPU System Agent voltage to 1.30v - 1.35v.

See if this helps stabilize your memory.

 

 

 

I gave this a try but Memtest86 fails with a lot of errors - like 90 errors at 60%...

Nate152
Moderator

I don't think I'd feel comfortable going any higher with the voltages, so the next thing would be to try the Dram Frequency at 8000MHz.

 

 

 

Nate152
Moderator

Have you updated to the latest motherboard bios?

This can help with memory stability.

 

 

 

Yes on latest bios.

Silent_Scone
Super Moderator

Hi @marios50 
The Encore should have a Memory Preset tab under the DRAM Timing Configuration page. Check some of the m-die profiles to see if they aid stability. You’ll need to set DRAM frequency manually.

9800X3D / 6400 CAS32 / ROG X870 Crosshair / TUF RTX 4090

I couldn't find a preset for 2x24GB at all:/