How is this compared to the Ballistix Sport LT? Better performance than the LT? Worse? Trying to see where to go.

Can't answer as I have never used Ballistix Sport memory.

will these work in a razer blade 15 2019 year model?

I have no idea. You have to look at the specs for the motherboard. The specs will advise as to what technical specs as to memory are required. Also, motherboard manufacturers have designed the slots on the board different ways to help prevent the use of improper memory. Memory speed is most important as the memory must accept the clock speed on the motherboard.

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Crucial Ballistix 2666 MHz DDR4 DRAM Laptop Gaming Memory Kit 32GB (16GBx2) CL16 BL2K16G26C16S4B

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DDR4 2666 (PC4 21300)
CAS Latency 16
Ideal for laptop gamers and performance enthusiasts
Engineered for the latest AMD and Intel platforms
XMP 2.0 support for automatic overclocking, or run at JEDEC default profile
Aluminum heat spreader included for thermal management in a compact space

Overview

Specs

Reviews (25)

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Model
Brand	Crucial
Series	Ballistix
Model	BL2K16G26C16S4B

Details
Capacity	32GB (2 x 16GB)
Type	260-Pin DDR4 SO-DIMM
Speed	DDR4 2666 (PC4 21300)
CAS Latency	CL16
Timing	16-18-18-38
Voltage	1.20V
ECC	No
Buffered/Registered	Unbuffered
Multi-channel Kit	Dual Channel Kit
Heat Spreader	Yes
Features	Ideal for laptop gamers and performance enthusiasts
Recommend Use	AMD & Intel Compatible

Additional Information
First Listed on Newegg	January 31, 2020

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Limited Warranty period (parts): Lifetime
Limited Warranty period (labor): Lifetime
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Return for refund within: 30 days

Return for replacement within: 30 days

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Crucial Ballistix 2666 MHz DDR4 DRAM Laptop Gaming Memory Kit 32GB (16GBx2) CL16 BL2K16G26C16S4B

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Customer Reviews of the Crucial BL2K16G26C16S4B

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Warranty, Returns, And Additional Information

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Item#: N82E16820164172

Crucial Ballistix 2666 MHz DDR4 DRAM Laptop Gaming Memory Kit 32GB (16GBx2) CL16 BL2K16G26C16S4B

Learn more about the Crucial BL2K16G26C16S4B

Customer Reviews of the Crucial BL2K16G26C16S4B

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info