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4GB Module ( 1 x 4GB ) | DDR4 2133 MHz ( PC4-17000 / PC4-2133P ) | DDR4 DIMM ( 288-Pin ) | Non-ECC UDIMM ( Unbuffered DIMM ) | 1Rx8 - Single Rank x8

A-Tech 4GB RAM Replacement for HP 798033-001 | DDR4 2133MHz PC4-17000 1Rx8 1.2V UDIMM Non-ECC 288-Pin DIMM Memory Module

Can I upgrade my RAM by upgrading the current 4GB DDR3 in the original socket because my laptop only has 1 built-in socket (ASUS X541SC)? - Quora

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I have been using a 4GB RAM for 10 years. I want to upgrade to 8GB. Should I just add another 4GB stick or replace and add 2 new ones? - Quora

Choose Memory - PCPartPicker

Compatible with select DDR4 Desktop computers + Easy to install at home, no expertise required Maximize your system's performance, boost loading

A-Tech 4GB DDR4 2133 MHz UDIMM PC4-17000 (PC4-2133P) CL15 DIMM Non-ECC Desktop RAM Memory Module

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HP 753220-S21 - 8GB PC4-17000 DDR4-2133MHz 1Rx4 1.2v ECC Registered RDIMM (Third Party)