Dell Inspiron 7559, the computer comes with 8GB of Hynix DDR 3L1600 MHz memory, which can be added up to 8GB. You can choose DDR3L 1600MHz 8GB.

Toshiba MQ02ABD 100H that comes with Dell Inspiron 7559 is slow to use, and this pc comes with m.2 interface, which supports SATA protocol and does not support NVMe. So the memory you buy should support SATA protocol.

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Dell Yue Ling 15 7559, the original memory is DDR3L 1600, so it is meaningless to change it to DDR4 2 133Mhz.

The reason for this is the following：

1. Although the processor of this Dell gamebook supports DDR4 memory, the motherboard is DDR3L memory interface, and the two interfaces are different, so it cannot be replaced.

2. If you switch to DDR3L 2 133Mhz memory, the frequency will be reduced to 1600Mhz, so it is meaningless.

To sum up, although the processor of this Dell gamebook supports DDR4 memory, the motherboard is DDR3L memory interface, which is different, so it cannot be replaced. It's best to add DDR3L 1600Mhz, and the game will be very powerful with SSD.