Desperate Cry for Help - 14900KS + Apex Encore + G.Skill 6800J3445G32GX2-TZ5RK

[Mikep15665]

Hello everyone,

So I bought the configuration specified above - Great 14900KS chip with high P and E scores, but with an MC score of 87.
SP score is 113.

I'm using the Liquid Freezer II 420 and made sure the contact frame is not too tight or too loose. 

Issue: I'm trying to activate the XMP profile for the G.Skill 6800J3445G32GX2-TZ5RK, but the PC simply would not boot, and if it does, I immediately get a BSOD error. I tried running the XMPI and II even with slower DRAM Freq such as 6200mhz or even 6000mhz, but to no avail.

Even attempting to manually increase the following voltages didn't make a difference: 

• CPU System Agent Voltage to 1.2v
• DRAM VDD & VDDQ to 1.45v
• IVR Transmitter VDDQ and Memory Controller Voltages to 1.3v.

SVID behaviour is set to TRAINED, and anything other than the values I mentioned are set to AUTO.

Other than purchasing a different kit, I honestly do not know how to troubleshoot this any further, thus humbly asking for help.

Any suggestion, guidance will be highly appreciated.

Thanks in advance,

Mike

[Nate152]

Hello Mikep15665

That memory kit shows it's compatible with ASUS Z790 motherboards and Intel 13th - 14th Gen cpu's.

Do you have your memory installed in the recommended slots A2-B2 (2nd and 4th slots from the cpu)?

[Mikep15665]

It's an Apex Encore board - it only has two RAM slots.........

[Nate152]

My mistake, you are correct.

I see you're familiar with the voltages relating to DDR5 memory.

Try these voltages:

1) Dram VDD voltage  - 1.45v

2) Dram VDDQ voltage - 1.45v

3) CPU System Agent voltage - 1.25v - 1.30v.

4) IVR Transmitter VDDQ voltage - 1.40v

5) Memory Controller voltage - 1.40v

Does this help get your memory stable at 6800MHz?

[Mikep15665]

Hi,

Thank you, but following your suggestion didn't yield a positive result:

[Vynra]

it sounds like you have have a dead ram stick or dead memory channel. since im assuming you can get into bios.use memtest that is in the bios screen on the top right.  i would use only 1 stick at a time and test to see (without xmp) if a ram stick fails but other doesnt. if both fail then it could be seriously bad luck with the ram sticks or  a bad memory channel.

[Mikep15665]

Nope.

memtest finished with no errors.

[Nate152]

Too many BSOD's will corrupt windows, so you may have to reinstall windows if it's not repairable.

Updating the bios can help with memory stability and compatibility.

Have you updated to the latest bios 1801?

ROG MAXIMUS Z790 APEX ENCORE | Gaming motherboards｜ROG - Republic of Gamers｜ROG Global

[Mikep15665]

Yes.

Memtest worked for almost 4h at stock speed - No errors:

[Nate152]

The ASUS Apex motherboards are notorious for being able to run high speed memory and you have the 14900KS cpu which is the best of the bunch.

I'm not sure why it's giving you trouble, it's looking like your cpu's memory controller isn't up to the task.

So, what I would try next:

1) Enable X.M.P. and set the voltages.

2) Scroll down to Dram Timing Control and click it.

3) At the very top of the Dram Timing Control page are the primary timings.

They should be set like so:

34

45

45

108

Command Rate may be set to auto.

4) Change the first primary timing and the command rate like so:

40

45

45

108

Command Rate 2N

5) Hit F10 and Enter to save and exit.

Is stability any better after trying this?