If you are puzzled about that yourlaptop is not running fast enough, caused by poor memory. This is a high speedDDR3 memory ram, which provides better performance and less consumption, sothat you can work efficiently on your computer.
 
Features:
Professional DDR3 Memory Ram, fullycompatible for DDR3 PC3-12800 desktop computer.
Built-in High quality chip, allows stableperformance and high speed running.
1600MHz high memory speed, improves the speedof the computer and brings convenience to your life.
4G large capacity provides powerfulperformance and storage space for daily reading and writing.
High-quality circuit module board,efficiently avoids from corrosion and abrasion, durable and portable to use.

Specification:
Color: White
Compatibility: For Desktop PC
Memory Type: DDR3
Capacity: 4GB
Memory Frequency: 1600MHz
Interface Type: DIMM
PINS: 240PIN
Size: Approx. 13.8x 4 x 0.5cm/ 5.4 x 1.6 x 0.2in
Package Weight: 50g

Package List:
1 x Memory Ram

About memory:
Memory ram is divided into SD, DDR, DDR2, DDR3, please refer to the following list to know what memory your computer needs and what memory you should buy:

PC2100 DDR 266
PC2700 DDR 333
PC3200 DDR 400
PC4200 DDR2 533
PC4300 DDR2 533
PC5300 DDR2 667
PC6400 DDR2 800
PC8500 DDR3 1066
PC10700 DDR3 1333
PC3-12800 DDR3 1600  
Some Tips:
If these conditions appeared: blue screen, crashed, restart, ringing alarm, please follow the following methods one by one, if no works, it means it is not compatible with your computer.
1. Failure to insert memory properly, or the interface is oxidized. Wipe the interface with an eraser and insert them again, or change the slot.
2. The memory slot is dusty or oxidized. Wash the slot with a brush.
3. Incompatible memory, change the memory.
4. CMOS is not discharging, restore factory setting, maybe it will be normal. (Remove the main board battery, and then reinstall).
5. The motherboard is incompatible with CPU. Try to change the CPU.
Note: Please DO NOT force to install if the memory ram is not suitable to your computer, because that will damage the memory and motherboard.