Question Does the Ryzen 7700X support 6400MHz RAM ?

[Minotaurs]

Hi everyone,

Just yesterday, I worked on a new build, I'm swapping my old Intel I7 gen4 with ddr3 to rog B650-A with 7700X with DDR5 6400MHz.
from what I found on the internet, Ryzen 7700X should support CORSAIR Vengeance DDR5 32GB (2x16GB) 6400MHz CL32.
now on default, I run the system with the lowest speed, when I choose in the BIOS the DOCP (Direct Overclocking Profile) with the right 6400MHz, the system does not boot, I get the memory problem debugging led on the motherboard, just when I reset the BIOS with CMOS pins, I choose the right DOCP setting for my memory and manually lowering the speed to 6000MHz, the system booting with the 6000MHz speed.

Does someone have any idea why it's happening?
also, my BIOS Ver.1413, is BIOS update can fix this problem?

Thanks.

 

[Zerk2012]

The highest official memory speed for the 7700x is 5400 so anything over that might need some adjusting or not even work.

I would leave it @6000 and call it done unless you wish to try adjusting other settings to try to get 6400 stable.

 

[Misgar]

Try setting XMP 6400MT/s, then manually relax the CL (CAS) timing by two clock cycles from CL32 to CL34. If this fails, try CL35 or CL36.

Remember, most RAM is designed for "Intel" systems and may not work with Ryzen CPUs if there is no EXPO (AMD) setting in the SPD.

If you're not using the latest mobo BIOS, update now for improved high speed memory compatibility.

 

[Tioym]

Your RAM needs to be supported by your motherboard. 6400 MHz sticks may be supported on your motherboard but the sticks you're trying to use may not be. So first ensure they are supported by your motherboard, you should be able to find this information on your motherboard's site in the support -> memory section.

If you have a supported kit of RAM and it still doesn't work then you can start asking other questions.

 

[Minotaurs]

I would leave it @6000 and call it done unless you wish to try adjusting other settings to try to get 6400 stable.

Thanks for your reply, I will try to play with the setting and it will not work I will use the 6000MHz

Try setting XMP 6400MT/s, then manually relax the CL (CAS) timing by two clock cycles from CL32 to CL34. If this fails, try CL35 or CL36.

Thank you so much, I will definitely try this.

So first ensure they are supported by your motherboard, you should be able to find this information on your motherboard's site in the support -> memory section.

You're right, this speed isn't supported by my MOBO, it's interesting that 5600, 6000, and 7200 are supported as Corsair RAM.

 

[Minotaurs]

So now I have another question.
When I expand my RAM and add another 32GB, can I add 6000Mhz if the system now runs stable at 6000?

 

[Tioym]

You're right, this speed isn't supported by my MOBO, it's interesting that 5600, 6000, and 7200 are supported as Corsair RAM.

"Speeds" aren't supported, what's actually supported is the RAM SKU. Take out a stick and read your RAM's SKU and then see if that SKU appears in the Memory QVL list for your motherboard.

So now I have another question,
when I expend my RAM and add another 32GB, can I add 6000Mhz, if the system now runs stable at 6000?

Matching different sticks of RAM can yield varying results. Sometimes it just works, sometimes it refuses to even boot. I wouldn't take the risk because you cant be sure until you try it.

 

[Zerk2012]

So now I have another question.
When I expand my RAM and add another 32GB, can I add 6000Mhz if the system now runs stable at 6000?

If you need 64GB of memory then sell yours and buy a 2X32GB set for 64GB.
When you add more memory that has not been tested together expect the worst and hope for the best.
Most of the time if it even works together your going to loose more speed (lower the speed to get it to work) because the memory controller is under more stress using 4 sticks.

 

[Minotaurs]

Most of the time if it even works together your going to loose more speed (lower the speed to get it to work) because the memory controller is under more stress using 4 sticks.

Thank you for this information.
I always thought that better to use 4 sticks of RAM than 2

 

[Minotaurs]

@@@ FIXED @@@
I did a Bios update from ver.1413 to ver.1654
after the installation I just chose the DOCP for my RAM and the system is powered up just fine.

Thanks everyone

"Speeds" aren't supported, what's actually supported is the RAM SKU. Take out a stick and read your RAM's SKU and then see if that SKU appears in the Memory QVL list for your motherboard.

my RAM SKU is CMH32GX5M2B6400C32W is not in the memory QVL list.

 

[sonofjesse]

I run 7700x and 6000mhz zero issues and super stable.