Extreme RAM Confusion, Help Please!

Hello IT experts,

I need your serious help.
Basically, I have an HP Pavilion 15-cc134tx laptop. Upon checking official HP website for laptop description, it says installed RAM 8GB 2400Mhz. (https://support.hp.com/au-en/document/c05881900)
Upon checking from CMD utility in windows "wmic memorychip get speed", it says 2400Mhz rate.
Upon checking from task manager memory details, it's showing 2400Mhz speed.
BUT upon physically opening laptop panel and checking the ram installed inside is 8 GB DDR4-2666 SDRAM.

Can someone please guide me which is the right RAM for this model? Should I purchase 8GB 2666Mhz speed RAM or 8GB 2400Mhz RAM?
My only objective is to increase the ram capacity to 16GB.



  • +4 votes

    Someone correct me if I'm wrong, but I think the motherboard in the laptop can only support 2400 MHz speeds, so you can still put in 2666 MHz sticks but it will just run at 2400 MHz


      Thats right, It will just underclock the RAM to 2400 MHz


        Thanks for the information, so should I purchase 2400Mhz or 2666Mhz 8GB RAM?

        • +1 vote

          You can buy any speed RAM, but it will run at 2400Mhz in your laptop, so there's no point in spending more money on faster RAM although if it's cheaper then by all means get it.

  • +1 vote

    Always buy identical ram to existing ram.


      If your not gaming (i.e. not concerned about clock speeds & timing) then it doesn't matter so much - the motherboard will always match to the slowest stick. So no, it doesn't always have to be identical.


        For compatibility reasons, even if the risk is slight, you want to use identical, or as similar as possible, RAM.

  • +1 vote

    Your laptop appears to be limited to 2400MHz RAM, so as others have pointed out, there's no point in buying faster RAM. HP probably put in the 2666MHz RAM as its generic stock they use for their other models as well.

    Laptops can be kind of finicky so I recommend sticking to vendors that have compatibility lists. Crucial is pretty good with this - they have your specific model too. An 8GB stick for your laptop can be had for $55 from Amazon and most local computer shops.

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