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Green rectangular circuit board with gold edge contacts and black memory chips on both sides

A-Tech

A-Tech 4GB DDR4 2133MHz CL15 1.2V 260-Pin SODIMM Laptop RAM

SKU CH-QMYY-73A9W

4GB DDR4 2133MHz CL15 1.2V 260-pin SODIMM laptop memory upgrade compatible with HP 854977-800 and 865980-001

  • Total capacity4 GB
  • Rated speedDDR4 2133 (PC4 17000)
  • CAS latencyCL15
  • Rated voltage1.2 V
  • Buffer typeUnbuffered
  • Recommended forCompatible Replacement for HP 854977-800, 865980-001
  • 4GB capacity adds multitasking headroom for everyday workloads
  • DDR4 2133MHz CL15 timing delivers responsive system performance
  • 2V standard voltage keeps power draw low
  • 260-pin SODIMM form factor fits compatible laptop slots
  • Replaces HP part numbers 854977-800 and 865980-001

4GB DDR4 2133MHz SODIMM for HP

This 4GB DDR4 2133MHz CL15 SODIMM is a direct replacement for HP part numbers 854977-800 and 865980-001. It runs at 1.2V with a 260-pin unbuffered non-ECC layout. The module targets owners of compatible HP laptops, notebooks and all-in-one PCs who need a straightforward capacity upgrade.

Who this suits and who it does not

Buyers looking to replace a failed stick or add a single 4GB module to a supported HP system will find the correct fit here. It is not for systems that require ECC or registered memory, nor for builds needing higher capacity per slot, faster speeds or lower latency than CL15. Builders assembling desktop PCs should look elsewhere because this is a SO-DIMM form factor.

The specification that decides compatibility

The decisive figure is the 260-pin DDR4 SO-DIMM interface combined with 2133MHz CL15 timing at 1.2V. Your laptop must accept non-ECC unbuffered DDR4 SO-DIMMs at this exact speed and voltage for the module to work. Verify the HP part numbers 854977-800 or 865980-001 against your service manual before ordering.

How it compares

Measured against everything we stock in Laptop RAM, at today’s prices. Recalculated every night.

Price $25.99
Cheaper than about 79% of the 2,079 comparable items (median $70.99).
Total capacity 4 GB
Lower than about 80% of the 1,886 comparable items (median 16 GB).
Price per GB $6.50 per GB
Pricier than about 56% of the 1,886 comparable items (median $5.94 per GB).

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Specifications

Product
Brand nameA-Tech
Product lineCompatible Replacement for HP
Model name854977-800, 865980-001
Total capacity4 GB
Product type260-Pin DDR4 SO-DIMM
Performance
Rated speedDDR4 2133 (PC4 17000)
Memory
CAS latencyCL15
ECC supportNo
Buffer typeUnbuffered
Heat spreaderNo
Power
Rated voltage1.2 V
Compatibility
Recommended forCompatible Replacement for HP 854977-800, 865980-001

Questions about this item

Will this 260-pin DDR4 SODIMM fit my laptop's memory slot?

Yes, the module uses the standard 260-pin DDR4 SO-DIMM form factor used by most laptops and all-in-one PCs that support DDR4 memory.

What is the correct way to seat the module so it locks in place?

Align the notch on the module with the key in the slot, insert at a slight angle, then press down firmly until both side clips click audibly to secure it.

Does this 1.2V DDR4 module need any future maintenance or replacement?

No, it is a solid-state component with no moving parts; it requires no maintenance and is covered by a lifetime warranty for the original purchaser.

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