Any reason why one can't use a crucial or samsung ram which is same speed for a fraction of the price?

SAMSUNG M471A1K43CB1-CTD 8GB DDR4 will work and not give warnings. Also, it's double the memory for half the price.

Just wondering why this is $90 when you can buy an equivalent piece for $30 elsewhere?

I use cheaper modules and they work fine

Compatible with DS2419+?

For the price of Synology Branded memory and the fallout for having gotten it wrong, do not trust this type of Q/A to some random stranger off of amazon. Open Synology's official documentation about what memory is supported in what system and go off of that.

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⚡ Power your Synology NAS with speed and efficiency — don’t get left behind!

PERFECT COMPATIBILITY - Specifically engineered for Synology 18, 19, and 20 series models ensuring plug-and-play reliability.
ENERGY EFFICIENT POWER - Runs at a low 1.2V voltage to keep your system cool and power bills down without sacrificing speed.
FUTURE PROOF YOUR STORAGE - Boost your NAS’s responsiveness and future-proof your data management with this essential memory upgrade.
COMPACT SO DIMM FORM FACTOR - Slim and sleek design fits perfectly in compact NAS units, maximizing space without compromise.
TURBOCHARGE YOUR NAS PERFORMANCE - Upgrade your Synology system with lightning-fast DDR4-2666 RAM for seamless multitasking and data handling.

The Synology SODIMM Non-ECC DDR4-2666 4GB RAM module delivers a high-speed 2666 MHz memory upgrade designed specifically for Synology NAS models from the 18, 19, and 20 series. Its low 1.2V power consumption and compact SO-DIMM form factor ensure efficient, reliable performance tailored for professional-grade data storage and multitasking.

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RAM	4 GB DDR4
Memory Speed	2666 MHz
Brand	Synology
Series	D4NESO-2666-4G
Item model number	D4NESO-2666-4G
Item Weight	0.704 ounces
Product Dimensions	1.8 x 3.75 x 0.3 inches
Item Dimensions LxWxH	1.8 x 3.75 x 0.3 inches
Color	Multicoloured
Computer Memory Type	DDR4 SDRAM
Voltage	1.2 Volts
Batteries	1 Lithium Ion batteries required.
Manufacturer	Synology
Language	English, English, English, English, English
ASIN	B07X5MMGWG
Is Discontinued By Manufacturer	No
Date First Available	August 30, 2019

Synology SODIMM Non-ECC RAM DDR4-2666 4GB (D4NESO-2666-4G)

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