is it compatible with Acer Aspire 5742 laptop?

The short answer is NO. This stick does meet all of the Acer requirements for an upgrade to that laptop. But it is not a Kingston issue. I tried three different brands of memory on that laptop, and was on the phone with tech support with all of them, including three times with Acer. Bottom line was Acer doesn't really know what memory will work in their laptop. Kingston still rocks!

compat with hp pavilion 17 notebook pc?

Go to Kingston's website and plug in your HP Model information and they will tell you if this is compatible.

I have Macbook pro (Early 2011). If I buy one of this (8GB), Will it work on my Macbook?

Macs are very particular in their RAM selection, they like the speed to match. There are 14 different Macbook Pros for 2011, all the ones I checked used DDR3 1333, so the answer is "probably not". While most PCs will just run the memory slower, Macs will tend to not start with the wrong speed installed.

where do I find the driver for this?

Memory does not require drivers, so you won't find a driver anywhere.

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Kingston 8GB Unbuffered DDR3L 1600 (PC3L 12800) System Specific Memory Model KTH-X3CL/8G

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DDR3L 1600 (PC3L 12800)
Supports: Select HP/Compaq Laptops

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All Kingston memory modules must perform properly to ensure maximum performance. Therefore, Kingston has developed an industry leading quality process to ensure that Kingston memory delivers superior quality, performance, and 100% compatibility with the computing system the module is designed for.

Model
Brand	Kingston
Model	KTH-X3CL/8G

Details
Capacity	8GB
Type	204-Pin DDR3 SO-DIMM
Speed	DDR3L 1600 (PC3L 12800)
CAS Latency	CL11
Voltage	1.35V
ECC	No
Buffered/Registered	Unbuffered
Rank	2Rx8
Heat Spreader	No
Compatible System	Compatibility: HP - Notebook - Pavilion 15, 17 HP - Notebook - ProBook 450, 455, 470

Additional Information
First Listed on Newegg	April 19, 2019

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Kingston 8GB Unbuffered DDR3L 1600 (PC3L 12800) System Specific Memory Model KTH-X3CL/8G

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Kingston 8GB Unbuffered DDR3L 1600 (PC3L 12800) System Specific Memory Model KTH-X3CL/8G

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