buki67 Honor Student
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HP Recommended

Mix DDR4 memory 2133 MHz and 2400 MHz RAM modules

Probook 440 G4
Microsoft Windows 10 (64-bit)


I got a new laptop HP Probook 440 G4 that came with one 8 GB RAM memory module 2400 MHz CL17 1.2V 260pin SODIMM from Samsung. It has Intel i5 7200 CPU.

I was expecting it to come with one 8 GB RAM 2133 MHz memory module, based on their description when I made the order, so I prepared another (my) 8 GB 2133 MHz module to add it to the laptop when it arrives.

Would you please help me with a couple of questions, so I can see what options are available to me?


1. Can I mix one  DDR4 8GB 2400MHz CL17 module with one DDR4 8GB 2133MHz CL16 module to make total 16GB RAM?


2. Is it better if I mix one 2400MHz CL17 8GB module with another 2400MHz 8GB but with CL16 ?


3. Can this HP Probook 440 G4 with i5 7200u CPU support 32GB RAM (2 modules of 16GB DDR4 2400MHz CL14 or CL17)?


During my work I often run a couple of virtual VBOX machines on my laptop, where each virtual machine uses 8GB of RAM, so having 32GB RAM on the laptop would be useful.


Thank you,




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Message 2 of 2
Flag Post
HP Recommended

Mix DDR4 memory 2133 MHz and 2400 MHz RAM modules

Hi Buki,


According to MSG, it comes with PC4-17000, 2133MHz, DDR4 SODIMMs�

8-GB , HP part number 820570-001�

Both the RAMs are DDR4 1.2V 260-pin SO-DIMM SDRAM.

If it is currently harbouring 2400MHz , it down clocks to 2133MHz i.e., configured speed. Latency is nothing to be worried about (CL17, CL14).

Page 2, max 16gb is what is listed.

Get module with exact specs, voltage, configuration as listed in the manual. It is guaranteed to work.

By mixing 2400MHz with 2133MHz, both will work in 2133MHz dual channel mode.

Go through page 36, 37 in manual for instructions.


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