Memory tuning for AM5 | Linus Tech Tips | Page 1

wooden parrot Mar 20, 2023, 12:20 PM

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Hi everyone, so I have some Intel certified memory, specifically G.SKILL Ripjaws S5 with 32GB (16x2) 6000MT, my CPU is an Zen4, AM5 Ryzen 7950x, I have been trying to tune the memory to get the best out of it but I am seeing some weird results, so I am hoping somebody here can help me out, CPU-Z and HWInfo64 are both reporting that my ram is running at 3200MT, Initially I thought this was because the UCLK was set to MEMCLK / 2 (half the speed) so I changed that to UCLK=MEMCLK and it still remains the same in CPU-Z and HWInfo64, I am going to try and lower my memory clock to 6200 then to 6000 and I will report back with the results, maybe I was a bit too optimistic running it at 6400MT even though it is rated for 6000MT, also I think my timings are running at what I set in the bios?

https://cdn.discordapp.com/attachments/1031222747491213453/1087341844247085076/IMG_20230320_114745.jpg
https://cdn.discordapp.com/attachments/1031222747491213453/1087342844555034774/IMG_20230320_115125.jpg
https://cdn.discordapp.com/attachments/1031222747491213453/1087342844970278983/IMG_20230320_115143.jpg

https://i.imgur.com/BYCACLu.png
https://i.imgur.com/K8VUh2e.png
https://i.imgur.com/8LgnWWj.png

This is the ram kit I bought - https://www.gskill.com/product/165/377/1649234797/F5-6000J3040F16GX2-RS5K-F5-6000J3040F16GA2-RS5K

Lastly can somebody tell what my Infinity Fabric Frequency should be, and if / how it relates here?

Thanks in advanced.

Imgur

wooden parrot Mar 20, 2023, 12:43 PM

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So after going back to 6000MT its now running even slower (3000MT) reported by HwInfo64 and CPU-Z, it still seems to be half of what I have set.

frail trout Mar 20, 2023, 12:46 PM

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wooden parrot So after going back to 6000MT its now running even slower (3000MT) reported by H...

Wouldn't that be the double data rate? 3000 + 3000 = 6000

wooden parrot Mar 20, 2023, 12:47 PM

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I am not familiar with how it works, it is my first time tuning / even caring about ram timings tbh.

frail trout Mar 20, 2023, 12:48 PM

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wooden parrot I am not familiar with how it works, it is my first time tuning / even caring ab...

I'm pretty sure if you look on task manager it will report at 6000mhz

wooden parrot Mar 20, 2023, 12:49 PM

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Yes it does, but what worried me was HwInfo and CPU-Z both reported half of what I have set.

frail trout Mar 20, 2023, 12:50 PM

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I think it's because they are reporting the speed without the double data rate. I wouldn't know how to explain it. I just know that ddr means double data rate so they double the speed and that's what they show on the box when you buy.

wooden parrot Mar 20, 2023, 12:50 PM

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ah ok

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Other than that, are the timings correct?

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those seem to be inconsistent with what I have set in bios

frail trout Mar 20, 2023, 12:52 PM

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I can't help you with ram overclock, never done it past upping the MHz lol

wooden parrot Mar 20, 2023, 12:53 PM

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