Does this work on a Lenovo A9 - 9420 laptop?

The Ram clock speed for your A9 APU might down clock to 2133MHZ! But running in single channel will clock it to 1066MHZ like DDR3L! I wouldn’t put this stick of DDR4 ram in a DDR3 machine! It might not post on the first boot or it might not boot at all!

I have m471a1g43db0 -cbp in one slot. will this be compaitible with it in 2nd slot to expand to total 16 gb

It should, your old memory is slower speed

Will this work with acer Acer Aspire 5 ?

Are you swapping out a single module, or adding RAM to your machine? If adding RAM, you really should pair the exact same type of module with it, (DDR rating, speed/bandwidth, latency, etc), just open your laptop up and look at the sticker on the module itself. If you are replacing a single module to be used on its own, then yes this RAM should work in the Acer aspire 5, it uses DDR4 and the 260-pin sodimm form factor.

Does it wortks on lenovo 81w10094us laptop?

if you have available DDR4 260pin DDR4 memory module, then yes

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🚀 Upgrade your laptop’s brainpower—because speed and reliability never go out of style!

COMPACT 260 PIN SO DIMM - Perfectly engineered for sleek laptops and ultrabooks, maximizing performance without bulk.
RELIABLE SAMSUNG QUALITY - Backed by a lifetime warranty, ensuring your memory upgrade is future-proof and worry-free.
BLAZING FAST 2666 M HZ DDR 4 - Experience seamless multitasking and lightning-quick data access with cutting-edge DDR4 speed.
POWER SAVVY 1 2 V OPERATION - Optimized low voltage design keeps your laptop cool and battery life longer—work smarter, not harder.
8 GB CAPACITY FOR NEXT LEVEL PRODUCTIVITY - Boost your workflow with ample memory to handle demanding apps and multitasking like a pro.

The SAMSUNGM471A1K43CB1-CTD is an 8GB DDR4 SO-DIMM laptop memory module running at 2666 MHz with a low 1.2V power draw. Featuring a 260-pin form factor and CL19 latency, it delivers fast, efficient, and reliable performance backed by Samsung’s lifetime warranty—ideal for professionals seeking a seamless productivity boost.

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Brand	SAMSUNG
Package Dimensions	17.7 x 12.6 x 1.09 cm; 18.14 g
Item model number	M471A1K43CB1-CTD
Manufacturer	SAMSUNG
Series	M471A1K43CB1-CTD
Color	Multicolor
Form Factor	SO-DIMM
RAM Size	8 GB
Memory Technology	DDR4
Computer Memory Type	DDR4 SDRAM
Memory Clock Speed	2666 MHz
Voltage	1.2 Volts
Are Batteries Included	No
Item Weight	18.1 g

SAMSUNGM471A1K43CB1-CTD 8GB DDR4 PC4-21300, 2666MHZ, 260 PIN SODIMM, 1.2V, CL 19 laptop ram memory module

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