[SOLVED] Ryzen 1300X can run XMP but new 1800X cannot

Feb 23, 2019
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Hello,

My old Ryzen 1300X can run XMP but my new 1800X cannot, system keeps rebooting until bios is reset automatically.

GSkill 2800Mhz C15 Hynix and GSkill 2666Mhz C15 Samsung both 1.25V.

So far I tried overclocking without XMP, raising memory voltage up to 1.4V, changing latency to 16 and setting to anything higher than 2133Mhz and updated my motherboard bios to latest ASRock AB350 Pro4 v5.40.

I am stuck at 2133Mhz with the 1800X but I was running stable 2866Mhz C15 1.25V with the 1300X.

Also bios says Single Channel but my configuration and CPUZ are Dual Channel.
 
Feb 23, 2019
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Yes, it was perfectly stable at 2866Mhz Dual Channel with the 1300X which makes me think something is wrong with the 1800X but everything is stable with the 1800X...

Does 2866Mhz vs 2133Mhz makes a noticeable difference in speed?
 
Feb 23, 2019
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I tried one stick with the 1800X and XMP worked at 2866Mhz C15 1.25V but when I pop in the 2nd stick PC will reset to 2133Mhz.

So the memory controller on the 1800X is different from the 1300X?
 
Feb 23, 2019
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The 1300X was running 3900Mhz 1.4V and the 1800X is running 3900Mhz 1.35V. I tried without overclocking still same result.
 

COLGeek

Titan
Moderator
You need to start with a solid base before cranking up the speeds. Set the CPU to stock speed. Then try inching up the speed on the memory.

Your best course of action would be to install matching memory. With the changed config, 2133 may be all you can achieve.
 
Feb 23, 2019
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Thanks, I will just run the RAM at lower CAS like 11 to compensate. I have checked 2133Mhz C12 vs 2800Mhz C15 and there isn't not much difference in speed, in games at least.
 
Feb 23, 2019
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Just to let people in the same situation know that I fixed the issue by installing a new CPU cooler. I bought matching memory compatible with my motherboard and the issue still persisted. I read on another forum that the pressure on the CPU if the cooler is too tight can make the memory controller in the CPU not work properly. I was using the 1300X cooler on the 1800X so I bought a new CPU cooler and reinstalled the CPU. Now the same and the newer RAM runs in dual channel, 3400Mhz the newer one. It was a hard issue to track honestly.
 
Feb 23, 2019
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I ran the CPU with no cooler for a couple of seconds and the bios said dual channel, when I installed the wraith cooler it said single channel so its not the heat.
 

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