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Incompatibility from RAM card or laptop model

ram upgrade commpatibility

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Hey, I currently using a HP Pavilion 14 Notebook PC, and my current RAM is a 4GB 1RxB PC3L-12800S-11-11-B3.
I hope to increase the RAM of the laptop by adding a RAM card from my previous laptop Lenovo Y470, the RAM card being 4GB 2Rx8 PC3-10600S-09-10-F2.
I have tried adding the extra RAM card and booting up on my HP laptop but the RAM still remains at 4GB. I want to know how and why it happens. Does the incompatibility arise from the laptop model or the existing RAM card?

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:welcome:     akakaaykay,


I have tried adding the extra RAM card and booting up on my HP laptop but the RAM still remains at 4GB.



Couple of questions if I may;


Where is the 4GB showing, in the BIOS, in Windows or in both.


Is your operating system 32 or 64-bit.


Meanwhile a possible explanation, the present 4GB 1RxB PC3L-12800S-11-11-B3 memory stick is the 1.35V low voltage type whereas the 4GB 2Rx8 PC3-10600S-09-10-F2 memory stick that you have now fitted is the more commonly used 1.5V type, this could explain your problem if the Samsung Ram is not the dual voltage type that is compatible with both 1.35 and 1.5V memory slots, Crucial explain this better here than my waffling would  :)



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