DDR4 MRC Training

[CherhLin]

Hi,

Does anybody know how the MRC training work?

We are using DDR4 parts support up to 3200 speed grade

and set to 2400 speed grade in SPD EEPROM.

The Intel Whiskey Lake U SOC can support max. of 2400 speed grade DDR4.

In BIOS, the maximum memory frequency is set to [Auto].

Does MRC training automatically downgrade to 2133 speed then re-do the MRC training

when MRC training failed at 2400 speed at the very beginning run?

Thank you very much.

CherhLin

[DeividA_Intel]

Hello CherhLin,  

Thank you for posting on the Intel® communities. I understand that you have some inquiries related to the Whiskey Lake family.

In order to better assist you, please provide the following:  

1. Have you checked with the laptop manufacturer to confirm that their BIOS and motherboard support 2400MHz?

2. What is the exact processor and computer that you are using?

3. Can you provide more details about your request?

Regards,  

Deivid A. 

Intel Customer Support Technician

[CherhLin]

Hi Deivid:

My answers  to your questions:

1. Have you checked with the laptop manufacturer to confirm that their BIOS and motherboard support 2400MHz?

Answer: Yes, our boards work at 2133 and 2400MHz. The BIOS set Maximum Memory Frequency of 2400MHz.

2. What is the exact processor and computer that you are using?

Answer: We use Intel i7-8665UE processor. We build our own computers.

3. Can you provide more details about your request?

Answer: We just want to be sure our boards will work with either 2400MHz or 2133MHz with the quality variations of PCBs.

The SPD is set to 2400 speed grade.

It all depends on the Intel MRC Training Algorithm.

If MRC training ever encounter errors at 2400 speed

will MRC re-train at 2133 automatically?

Or MRC training just run at one specific speed set by SPD and BIOS setting only?

Hope my answers clarify my original questions.

Thank you very much.

CherhLin

[DeividA_Intel]

Hello CherhLin

Thanks for the confirmation. I noticed that you are using the Intel® Core™ i7-8665UE Processor, since this is an Embedded CPU I will move this thread to the Embedded Communities so you can get the proper support and accurate information.

• Thread: https://community.intel.com/t5/Embedded-Intel-Core-Processors/bd-p/embedded-core-processors

Thanks for your comprehension.

Regards,  

Deivid A.  

Intel Customer Support Technician  

[CarlosAM_INTEL]

Hello, @CherhLin:

Thank you for contacting Intel Embedded Community.

We sent an email to the address associated with this account with information that may help you.

Best regards,

@CarlosAM_INTEL. 

[CherhLin]

Hi CarloasAM:

I did not receive any e-mail from you.

Please resend.

Thank you very much.

Cherh-Lin

[CarlosAM_INTEL]

Hello,  @CherhLin 

Thanks for your reply.

We suggest reviewing the SPAM or undesired mail inboxes to find the email sent to you past February 16th.

By the way, please verify the address related to this account is the proper one.

Best regards,

@CarlosAM_INTEL.

[CherhLin]

Hi CarlosAM:

I do not find any e-mail from you.

I do receive e-mail from Intel every time someone replied my post.

Therefore my e-mail address should be valid.

Could you please re-send or just reply here?

Thank you very much.

Cherh-Lin

[CarlosAM_INTEL · Accepted solution]

Hello, @CherhLin:

Thanks for your clarification.

We sent again an email to the address associated with this account with information that may help you.

Best regards,

@CarlosAM_INTEL.