T440 dual CPU Upgrade

Question

Added a second CPU to a T440, original was Xeon Silver 4110, new (secondary) one is Xeon Gold 6138.
Boot thew this error: "CPU Error Invalid or unsupported Topology between CPUs detected. Please replace CPUs and pupulate in a supported configuration." Tried to swap, no luck either.

Have not found anything on supported configs besides https://dell.to/3AXjyfU page 7: "The Dell EMC PowerEdge T440 system supports up to two Intel Xeon Scalable Processor, up to 14 cores per processor"

Now to my surprise, the T440 easily handles the Xeon 6138 as a single CPU with no problem, even though it's a 20 core chip with a 495W PSU (got a 1100W one also to handle more)

In order to have 2 CPU's do I have to match them, as in 2X 4110 for example? -reason for the two is that i want to install a Quadro P4000 GPU at one point and it does need the 2 chips for it to work-

Thanks

Dell-Martin S · Accepted Answer

You're on the right track in your thinking about CPU configurations and their impact on other components in your T440. Let's break down your questions:

* CPU Core Limits and Dual-CPU Configuration: You're correct. The "up to 14 cores per processor" limitation in the T440 generally refers to the supported core count per CPU socket when you have two CPUs installed. The single 20-core 6138 likely works because, in a single-CPU configuration, the system can handle a higher core count on that single processor. However, if you were to install a second 20-core 6138, the system would likely exceed its design limitations for a dual-CPU setup, and it probably wouldn't boot or would be unstable. The system is designed and validated for specific thermal and power limits per socket and for the combined system. Exceeding either of those can cause problems.

* Dual Xeon 4214s and Quadro P4000: Yes, in theory, installing two Xeon 4214s (12 cores each) and splitting your RAM equally between the two CPUs should allow you to install and use a Quadro P4000. The reason this works is that you're staying within the supported core count per socket for a dual-CPU configuration. Distributing the RAM is crucial for dual-CPU systems, as each CPU has its own memory controller. Uneven RAM distribution can negatively impact performance.

* BIOS and iDRAC Updates: Keeping your BIOS and iDRAC up to date is excellent practice. These updates often contain crucial microcode updates for CPUs, which can improve compatibility and stability. They can also address other system-level issues. While it doesn't guarantee compatibility with every possible CPU, it significantly increases the chances of success.

* Manual Clarity: You're right, server documentation can sometimes be less than crystal clear, especially regarding specific component compatibility. Dell's support site and forums can sometimes be a good resource for user experiences with specific hardware configurations.

Key Considerations:

* Power: Ensure your T440's power supply can handle the increased power consumption of two CPUs and the Quadro P4000. Check the wattage of your current power supply and compare it to the combined TDP (Thermal Design Power) of the CPUs and the GPU, as well as the power requirements of other components. You might need to upgrade the PSU.

* Cooling: Dual CPUs generate more heat. Make sure your server has adequate cooling for the chosen CPUs. The T440 should have heatsinks designed for the specific TDP of the CPUs you intend to use. If you're unsure, consult the server documentation or Dell Sales support.

DELL-Charles R · Answer

Hello,

Yes you are correct. The Processors must match.

You must also match memory population for both. So if you have 2 DIMM on CPU1 you need identical 2 DIMM population on CPU2

It is also recommended to make sure your BIOS and iDRAC firmware are up to date.

chtth · Answer

@DELL-Charles R​ Thank you for that!Am I right in thinking that the 'up to 14 cores per processor' distinction only applies to the two CPU config and that is why the single 20 core 6138 works currently? And it would not work if I install a second one of those, making it 2x 20 core each?Also, in theory with your suggestion, if I get two Xeon 4214's  (12 core) split my RAM equally, it will allow me to install and use a Quadro P4000?BIOS and iDRAC is fully up to date too :)Also, sorry about the specifics, I found that the user and technical manuals are not the clearest on this topic.Much appreciated.

chtth · Answer

@Dell-Martin S​ Thank you very much for the breakdown.All points make sense.* Power - i'm already on a 1100W PSU, should be okay :)* Cooling - excellent point, I'm using official heat sinks, but great to know that I have to use specific ones.Amazing answers ans thank you again!

PowerEdge Hardware General

T440 dual CPU Upgrade

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