Dell Inspiron 7559 change ddr3 to ddr4. Is it possible.

Solution
Yep.
If you want MORE memory then you need to investigate what capacity is supported for your laptop.

Ideally you want the same memory sticks as well, so if you had 4GB already try to find an identical stick (if a spare slot exists) or ideally buy a 2x4GB kit (or 2x8GB kit if supported and you think you would benefit).
Yep.
If you want MORE memory then you need to investigate what capacity is supported for your laptop.

Ideally you want the same memory sticks as well, so if you had 4GB already try to find an identical stick (if a spare slot exists) or ideally buy a 2x4GB kit (or 2x8GB kit if supported and you think you would benefit).
 
Solution