ROG STRIX Z790-A GAMING WIFI II unstable XMP

[altair571]

Hi, I'm currently having issues with XMP stability (XMP_1, 2, Tweaked) after a new build. MemTest86 showed no errors after 4 passes at 7200 Mhz, however, XTU CPU stress test causes a hard crash within seconds(PC remains on but display is frozen and peripherals do not work). XTU memory stress test is fine. I've turned off XMP and it is stable at 4800 MHz but nothing higher. I've also checked the QVL list today, and it seems that it is no longer on the list. DIMM Flex also has the same issues and is still showing on its QVL list. https://www.asus.com/microsite/motherboard/dimm-flex-qvl-list/.

I've tried updating the bios to 0507 and updated all drivers but the issue is still there. Is there a beta BIOS update that may possibly fix the issue? I've checked Shamino's post but there is none for my one.

ROG STRIX Z790-A GAMING WIFI II
i9-14900K
2 x 16 GB CORSAIR Vengeance RGB DDR5 7200 MHz (CMH32GX5M2X7200C34)
MSI RTX 4070 Ti GAMING X SLIM 12 GB

[Silent_Scone]

Hi @altair571 

You can try the beta here:Re: RaptorLake Resources - Page 19 - Republic of Gamers Forum - 907811 (asus.com)

Looking at the QVL, the kit in question is yet to be validated for 14th gen CPUs. It's present on the 13th gen tables.

Whilst DIMM Flex granularity settings can help memory stability when there's variation in DIMM temperature, if the overclock is unstable from the get-go it isn't likely to help you much. 

Check out my overview here: ASUS ROG DIMM Flex: Customizing DRAM Memory Timing... - Republic of Gamers Forum - 974048

Try the new beta BIOS listed in the link, if it doesn't help with XMP stability report back and we can attempt to dial some of the associated voltages in manually.

[altair571]

Thanks for the quick reply. I looked at the 13 gen table as I was initially planning to get the 13900KS and assumed it would be supported for 14 gen.  The XTU CPU stress test still caused a hard crash within seconds at 7000 and 7200 MHz, and after about 30 seconds at 6800 MHz for all 3 XMP profiles. However, it passed at 6400 MHz after 30 minutes on XMP_2, and XMP_Tweaked. 

[Silent_Scone]

Ok. Is that on the new test BIOS or the existing one?

[altair571]

This is on the new test BIOS

[Silent_Scone]

Tune the associated memory rails. Start by increasing Memory Controller Voltage.

Extreme Tweaker > CPU System Agent
Extreme Tweaker > Advanced Memory Voltages > Memory Controller Voltage
Extreme Tweaker > Advanced Memory Voltages > IVR Transmitter VDDQ

[altair571]

Sorry for the late reply, but I ended up replacing the 14900K and it works fine now - stable at 7200 MT/s. Thanks for your help.

[woopsie]

By 'replacing' you mean RMA with Intel?
What reason you given to Intel? "Hey Intel my CPU doesn't work with XMP profiles"?

[altair571]

I had access to another 14900K which was stable at 7200 MT/s without changing any voltages so I ended up contacting Intel. They went through their troubleshooting steps (XTU stress test and other Intel troubleshooting software) and came to the conclusion that it was “faulty” and offered to replace it directly or with the retailer. I ended up returning it to the retailer as it was quicker (had to give the retailer the Intel support ticket number to get a replacement). Never heard back on why it was “faulty”

“Faulty” CPU SP score was 82 and the other one I had access to was 103. The replacement one is 116