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itaksojdet
Adept I

3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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I had perfect working system configuration Ryzen2600x, Gygabyte B450 Aorus M, 2 memory sticks (8Gb)*2 - HX432C18FB2K2/16 working at 3200MHz

But i bought a new Ryzen3700x in august, MB has the latest bios (50), but system doesnt post with TWO sticks on 3200MHz. 1st flashes memory led, after some seconds CPU ledand system doesnt run.

If i leave 1 stick it runs normally at 3200 and even OC. I tryed to rise a voltage at 1.350v but it didnt help to run with two sticks.
So my PC has lower perfomance then it could be...

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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It seems the problem is solved!
There is a section in bios called "AMD Overclocking". It duplicates some functions of M.I.T. section, you can select frequency and timings. I raise VDDIO  value by 25. Sometimes BIOS shows hints sometimes not, its rather buggy.
Value of 25 means 1.2+4mv*25
Also i selected 1600MHz and suddenly everything is working. AIDA benchmark showed 44Gb\sec on 3200 instead 40Gb at 2900MHz. Then i selected 1700MHz AIDA showed lower perfomance, so i set 1600MHz back and OC it slightly by timings, in last case AIDA showed 45gb/sec reading

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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so. now my DDR works at 2900+

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misterj
Exemplar

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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itaksojdet, please post a screenshot of Ryzen Master (RM) - simply drag-n-drop the image into to your reply.  What do you mean " rise a voltage at 1.350v"?  Are you using XMP or manual OCing?  Thanks and enjoy, John.

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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There are 2 profiles in bios - 1)3200MHz - was set by default and works only with one module 2) 2900MHz  - set manually by me, and works fine with two modules.
My modules are 3200 and worked on this clock with my previous CPU(Ryzen2600x)
Also i tryed to set manually freq to 3200 - doesn't work with two modules. Works fine with one module.

Безымянный.jpg

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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I changed timings to boost some perfomance to compensate lower frequency of memory.
But if you suddenly ask-initially all settings and timings were by default

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misterj
Exemplar

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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itaksojdet, please DL the free utility from Thaiphoon Burner and run it on your two sticks and post the screenshots.  Did you install a fresh copy of W10 after installing the 3700X?  I suspect you will need to talk to your memory vendor.  What slots do you have the sticks in and running either stick work at 3200 MHz?  If one does and one doesn't, you will need to RMA your kit.  I assume you did buy a dual channel memory kit.  Thanks and enjoy, John.

EDIT:Please do a Clear CMOS.

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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@Did you install a fresh copy of W10 after installing the 3700X?@ - Yes, i did
@I suspect you will need to talk to your memory vendor.  What slots do you have the sticks in and running either stick work at 3200 MHz?@ Slot 1 - 3, i ' ll check either stick tomorrow.
@ If one does and one doesn't, you will need to RMA your kit. @ I can't remember exactly i'll check tomorrow. What does "RMA" mean?
@I assume you did buy a dual channel memory kit. @ - yes
______________
But could you explain why did it work correctly with my previous CPU(2600x) and not working with new one.

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misterj
Exemplar

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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itaksojdet, your memory is in the wrong slots.  Please see your manual, page 10.  The two sticks should be in DDR4_1 and DDR4_2.  You can also try DDR4_3 and DDR4_4.  I cannot explain why it worked on your 2600X.  Good luck and enjoy, John.

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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Im sorry, slots that i called 1 and 3 reallly was DDR4_3 and DDR4_4 
If counting from cpu they are 1 and 3.
Now i changed slots to DDR4_1 and DDR4_2 and nothing changes? it runs only at 2900+
--------

I tried as you said yesterday every stick to run at every slot, and..... ONE STICK works well in any slot, another stick works only at 2900 in any slot... So it seems that the sticks work different, but.... they work fine with Ryzen 2600x! at 3200.

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itaksojdet
Adept I

Re: 3700x runs memory only 2900MHz, but 2600x runs the same memory and same MB with 3200MHz

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Maybe there is some reason that 2600x pulled both sticks, and 3700x pulls only 1? Maybe we should increase the voltage or something?

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