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Question Corsair DDR4 Vengeance LPX 2x16GB not running at 3200

henry90

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Nov 17, 2018
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Hello everyone,
a year ago I bought a new pc, including the Corsair DDR4 Vengeance LPX 2x16GB 3200.
As mobo I bought the Taichi x470. Up then I used to have a problem to make the ram run at 3200Mhz. The problem was that in order to activate the dual channeling I needed to place the RAM in the 2nd and 4th slot. Problem solved up then without anything else to be touched!
Today out of curiosity I did some tests again and I see that they are back running at 2133 .. thing is that on CPU-Z the dual channeling is active
Any suggestion on how to proceed by any chance? Thank you!

Ps: I wish I could post some pics but it seems that there is a problem with the website and an error pops up when I try to attach one.

Edit: I also tried to manually set the profile to 3200Mhz in the Bios but that doesn't work. Computer restarts 3 times and at the end switches back to 2133
 

DMAN999

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Please post your full system specs (including the exact Model number of all your components).
Like so:
CPU:
Motherboard:
Ram:
SSD/HDD:
GPU:
PSU:
OS:
Without that info we will not be able to provide accurate answers.
 

henry90

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Nov 17, 2018
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Not all Ryzen CPUs run at that speed. Which one do you have?
Forgot to mention it sorry: AMD Ryzen 7 2700X
But I repeat, up then everything was super fine!

Full setup:

AMD Ryzen 7 2700X
Asrock X470 Taichi
Corsair DDR4 Vengeance LPX 2x16GB 3200
Gigabyte GeForce RTX 2070 WINDFORCE 8G
Samsung 970 EVO 500GB
Samsung 970 EVO 1T
 

henry90

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Nov 17, 2018
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Try 3200 again but bump the voltage up 0.02 volts.

If that fails try 2933 /3000 at the correct voltage.
This is up then, a year ago, when I managed to make the RAM run at 3200 without any tweak:

View: https://imgur.com/Jg7RJBO


Why would I need to modify the voltage now all of a sudden? I tried to set the profile at 3000 in the BIOS and it seems to work! But still it's not what's meant to be..
 

DMAN999

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Ryzen 7 2700X - AMD - WikiChip
See Memory Configurations Table
While that is Technically accurate, it doesn't really tell the whole story.
Almost every AM4 MB can run RAM faster than 2933 with a Ryzen 2000 or 3000 CPU.
My 2600 on an Asus ROG Strix B450-F can rum RAM at 3200 and even 3400.

And Ryzen 3000 chips are stated by AMD to only run 3200 RAM BUT most people with Ryzen 3000 CPUs run 3600-3800 RAM kits without any issues.
My Asus ROG Strix X470-F / 3700x rig runs 3733 RAM without any issues at all.

His Asrock X470 Taichi states it can run 3200 RAM with a Ryzen 3000 CPU.
https://www.asrock.com/mb/AMD/X470 Taichi/index.asp#Specification
 

Zerk2012

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This is up then, a year ago, when I managed to make the RAM run at 3200 without any tweak:

View: https://imgur.com/Jg7RJBO


Why would I need to modify the voltage now all of a sudden? I tried to set the profile at 3000 in the BIOS and it seems to work! But still it's not what's meant to be..
Over clocks that were stable a year ago can become unstable over time. That is why I said try 3200 but bump the voltage up by 0.02 volts.
 
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DMAN999

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Things that were stable a year ago can become unstable over time. That is why I said try 3200 but bump the voltage up by 0.02 volts.
That is certainly worth a try.
Settting the DRAM Voltage to 1.36, 1.37 or 1.38 (instead of 1.35) might just do the trick.

It could also be a BIOS issue, if the OP updated his BIOS to a newer version (that is really meant for Ryzen 3000 CPUs).
I had that issue on my B450-F / 2600 rig.
I updated the BIOS (to a version with AGESA 1.0.0.3ABBA) to test my 3700x and when I reinstalled my 2600 my RAM would not run at 3400 like they did when I had the older BIOS version (with AGESA 1.0.0.6).
I downgraded the BIOS (which was a bit of a pain) and it runs at 3400 again.
 
Last edited:

Ralsei

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Oct 1, 2018
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Sad but true.
For whatever reason, the Corsair Vengeance LPX RAM seems to have issues running properly on Ryzen PCs.
Which is why I tell people to stay away from Corsair LPX when they're looking for recommendations for their Ryzen builds.

No issue using them with Intel, but with Ryzens it's a whole different story.
 
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henry90

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Nov 17, 2018
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Over clocks that were stable a year ago can become unstable over time. That is why I said try 3200 but bump the voltage up by 0.02 volts.
But I didn't overclock anything up then :/

Anyway, this is what I see in the BIOS:

View: https://imgur.com/trTb7nG


By quoting DMAN999:

Settting the DRAM Voltage to 1.36, 1.37 or 1.38 (instead of 1.35) might just do the trick.
that's far away from my current settings haha Should I bring the DRAM Voltage to 1.225 ?
 

henry90

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Nov 17, 2018
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Found the problem guys, the XMP profile must be set on ON and not AUTO.
Weird thing is that I didnd't update the BIOS, ever.. so I am wondering how possibly those settings changed from when I set them up the first time..
 
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