Will this work on a Lenovo IdeaPad Y700 15.6" (80NW000PUS)? Everything looks correct except for the PC4 21300 part. Mine says PC4 17000. I do not know what the difference is and when I google it, it is confusing!

The main difference between the RAM currently in your laptop and this model is the RAM speed (2133 vs 2666) MHz with higher RAM speed offering marginal improvements. I believe that this model of RAM will work in your computer, except that it appears that your laptop only supports a maximum RAM speed of 2400 before capping so looking at RAM with speeds of 2400 MHz may be a better option.

will these work on a 17" HP laptop w/i3 intel chip?

The Crucial 16GB (2 x 8GB) DDR4 2666 (PC4 21300) 260-Pin DDR4 SO-DIMM Laptop Memory is compatible with systems that take DDR4 2666 MT/s SODIMM memory. You need to check if your 17" HP laptop with an i3 Intel chip supports this type of memory.

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Crucial 16GB (2 x 8GB) DDR4 2666 (PC4 21300) 260-Pin DDR4 SO-DIMM Laptop Memory Model CT2K8G4SFS8266

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Capacity: 16GB (2 x 8GB)

64GB (2 x 32GB)
32GB
32GB (2 x 16GB)
16GB
16GB (2 x 8GB)
8GB
4GB

DDR4 2666 (PC4 21300)
CAS Latency 19
1.2V

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Crucial - DDR4 - 16 GB: 2 x 8 GB - SO-DIMM 260-pin - 2666 MHz / PC4-21300 - CL19 - 1.2 V - unbuffered - non-ECC

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Model
Brand	Crucial
Model	CT2K8G4SFS8266

Details
Capacity	16GB (2 x 8GB)
Type	260-Pin DDR4 SO-DIMM
Speed	DDR4 2666 (PC4 21300)
CAS Latency	CL19
Timing	19-19-19
Voltage	1.20V
ECC	No
Buffered/Registered	Unbuffered
Features	CT2K8G4SFS8266 is a 16GB Kit consisting of (2) 8GB Single Ranked DDR4 Notebook modules that operates at speeds up to 2666 MT/s and has a CL19 latency. It is an Unbuffered SODIMM. It conforms to the industry standard DDR4 SODIMM layout of 260 pins and is compatible with systems that take DDR4 2666 MT/s SODIMM memory.

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First Listed on Newegg	March 18, 2026

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Crucial 16GB (2 x 8GB) DDR4 2666 (PC4 21300) 260-Pin DDR4 SO-DIMM Laptop Memory Model CT2K8G4SFS8266

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