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Z690 APEX with 14900K can't handle xmp

ProNoob
Level 7

I have an ASUS ROG MAXIMUS APEX Z690 motherboard and XPG LANCER ROG 6600 cl32 DDR5 RAM.

I've been using a 13600K processor so far, and it worked perfectly in XMP mode. However, I switched to a 14900K processor, and if I start it in XMP mode, it encounters an error. C3 error code. If I revert to default settings (AUTO), it starts up, but only at 4800 MHz C40. 

The RAM is not on the QVL list, but before I bought it, I wrote to ADATA support to ask if it's compatible with my motherboard. They said the 6600 c32 XMP profile is, but the higher ROG certified 6800 is only available on Z790 motherboards. But 6600 would enough for me. Since it worked with the 13600K, I don't think the motherboard is the issue, it did work with the previous processor. I also checked the cooler to make sure it's not tightened too much, as that can sometimes cause memory issues, but there was no change. The CPU socket pins are also undamaged. The latest BIOS is installed (3401). I tried to reinstall bios and reset cmos, but not working. 

The Intel Diagnostic Tool runs, and there are no issues with the processor.

ASUS ROG MAXIMUS Z690 APEX
Intel i9 14900K
AX5U6600C3216G-DCLARROG  (32-44-44)
ASUS ROG RYUJIN II 360
EVGA SUPERNOVA G3 1000 Watt

I would like to ask for help from those who are more knowledgeable to see if they might know what the difference between the two processors is that could cause this error. Perhaps if I manually fine-tune the DDR settings in the BIOS, it might work. Do you have any ideas? Thank you!

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Jiaszzz_ROG
Customer Service Agent

Hello, @ProNoob 

Thank you for reaching out to us and providing the scenario details.
Based on your description, stable memory overclocking was achievable with the 13600K processor and the same memory, but not with the 14900K processor.
If attempting to reinstall the 13600K processor still allows stable memory overclocking, we would recommend trying to install memory from the ROG MAXIMUS Z690 APEX QVL or another 14th generation Intel CPUs for further cross-validation.
Alternatively, if necessary, you may seek assistance from the CPU retailer or Intel.

Thank you.

sharing complete hardware info & software config details will help us better understand the issue 🙂