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amir_t
Journeyman III

Ryzen 7 3800X and RAM problems

Hi Everyone,

So I built a PC the other day using:

MSI B450 Mortar Titanium MB

Ryzen 7 3800X

Corsair H60

Corsair Vengeance LPX 2X8GB DDR4 2400MHz CL16 CMK16GX4M2A2400C16 (2 sets, total of 32Gb by 4 sticks of 8gb (2 sets of 16gb))

Kingstone A1000 nvme 480gb SSD

Asus RTX 2080TI Dual Advanced GPU

Samsung EVO 850 480gb

Coolermaster 750W platinum 80+ PSU 

then I updated the bios to the last version (16/6/2020 ver) and then went into the bios and switched to XMP mode, 

BUT I went into a problem...., when I tested the PC using Userbenchmark my memory went like 60 to 72 percentile which is a very low score, then I opened the CPU-Z software and saw the following information:

Slot#1: 8gb 2400Mhz

Slot#2: 8gb 2133Mhz

Slot#3: 8gb 2400Mhz

Slot#4: 8gb 2133Mhz

PLEASE(!) if someone can tell me why does the CPU-Z is showing some of the memory sticks as 2133Mhz and not 2400Mhz???? 

Can someone help me to solve this issue?, thanks in advance!! 

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3 Replies

Re: Ryzen 7 3800X and RAM problems

Set the timings and voltage manually to what you see as the XMP in CPU-z, or as it's stated on the package.

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amir_t
Journeyman III

Re: Ryzen 7 3800X and RAM problems

Hi and thanks for your reply

just to make sure, should I put 16 16 16 39?

I have attached CPU-Z screenshots,

TWhatsApp Image 2020-07-13 at 20.46.52 (1).jpegWhatsApp Image 2020-07-13 at 20.46.52 (2).jpegWhatsApp Image 2020-07-13 at 20.46.52 (3).jpegWhatsApp Image 2020-07-13 at 20.46.52 (4).jpegWhatsApp Image 2020-07-13 at 20.46.52 (5).jpeg

Thank you,

Amir

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Re: Ryzen 7 3800X and RAM problems

Yes, 16-16-16-39 1.2v.

It needs to be said though that you're not losing -a lot- of performance with those speeds, -maybe- 1%, as AMD's work with the memory controller on the Ryzen 3000 series means memory speed is no longer paramount.

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