Extreme 4 Z390 - memory problem

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   Hello,

Few days ago I bought pair of DDR4 RAM sticks for my Extreme 4 Z390 MoBo. So far I was using 2x16GB Predator (Kingstone) 2666MHz CL13. No issue with them, therefore I looked for exact the same product and I found it. Unfortunately I cannot use them, and here is how it looks:
1) UEFI recognizes 64GB or RAM and starts without any warning beeps
2) System is able to load GRUB loader - I can do selection or change parameters there
3) After making a choice, system freezes, no matter if I'm booting from local disks of external devices

I tried different combination of memory sticks and slots - any presence of new RAM is responsible for freezing, old RAM works flawless.

RAMs are on hardware compatibility list for this MoBo.

Any idea what can I check/test/change in MoBo configuration?

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maciejos78 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 04 Jul 2019 Location: Poland Status: Offline Points: 136	Post Options Post Reply Quote maciejos78 Report Post Thanks(0) Quote Reply Topic: Extreme 4 Z390 - memory problem Posted: 05 Apr 2023 at 8:36pm
	Hello, Few days ago I bought pair of DDR4 RAM sticks for my Extreme 4 Z390 MoBo. So far I was using 2x16GB Predator (Kingstone) 2666MHz CL13. No issue with them, therefore I looked for exact the same product and I found it. Unfortunately I cannot use them, and here is how it looks: 1) UEFI recognizes 64GB or RAM and starts without any warning beeps 2) System is able to load GRUB loader - I can do selection or change parameters there 3) After making a choice, system freezes, no matter if I'm booting from local disks of external devices I tried different combination of memory sticks and slots - any presence of new RAM is responsible for freezing, old RAM works flawless. RAMs are on hardware compatibility list for this MoBo. Any idea what can I check/test/change in MoBo configuration?
	Regards Maciek

RLGL Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 29 Jul 2018 Location: MN Status: Offline Points: 1995	Post Options Post Reply Quote RLGL Report Post Thanks(0) Quote Reply Posted: 05 Apr 2023 at 9:47pm
	You must have a matched set from the start. One cannot add ram manufactured at a later date. In most cases it will be different. The individual chip can have different characteristics .
	Asrock Z370 Gaming K6,Intel i7 8700K, Asrock x570 Taichi

siberian Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 22 May 2023 Status: Offline Points: 45	Post Options Post Reply Quote siberian Report Post Thanks(0) Quote Reply Posted: 23 May 2023 at 12:34pm
	Try to turn off XMP/OC settings and go to the bottom of RAM OC settings page to turn Fast MRC off and AsRock optimizations on. Save & reboot. If still no luck ??turn the XMP profile on and reboot. Clean your MoBo RAM slots ??high frequency acts like a magnet for any kind of dust. Clean DDR contacts with isopropyl. Repeat XMP off/on reboot steps. Leave only a new ones RAMs plugged into A2 and B2 slots to check how they?�re.