Lenovo Legion Y740S Disassembly and RAM, M.2 SSD upgrade options

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My Lenovo Legion y740s is equipped with a 15.6-inch 16:9 4K IPS screen, the ninth generation core i7-9750h processor, 16GB dual-channel ddr4-2666 memory, 1TB NVMe SSD, and the Intel uhd630 graphics card that comes with the processor. In addition, the wireless network card supports the latest wi-fi6 standard.

My Lenovo Legion Y740S has a 15.6-inch 16: 9 4K IPS screen, equipped with a ninth-generation Core i7-9750H processor, 16GB dual-channel DDR4-2666 memory, 1TB NVMe SSD, and the Intel UHD630 graphics card. In addition, the wireless network card supports the latest Wi-Fi 6 standard.

It is not difficult to disassemble the machine. There are no hidden screws. Remove all the screws and use a spudger to pry open the buckles to remove the bottom plate.
Lenovo Legion Y740S Disassembly

The cooling module is quite special. As a thin and light product, it uses up to 4 turbo fans, and due to the thickness limitation, it does not use traditional heat pipes for heat dissipation. A small thickness achieves higher space utilization and a larger cross-sectional area to obtain the best possible thermal conductivity.

The SSD uses a PM981a from Samsung with a capacity of 1TB, divided into two partitions, and a system disk of 200GB. This is also the model with the strongest SSD performance in notebook products. The Legion Y740S is equipped with two M.2 NVMe ports. In addition to easy expansion, it can also achieve higher performance through RAID.
M.2 SSD

The continuous read performance of pm981a is 3445mb / s, and the continuous write performance is 2776mb / s.
M.2 SSD

A small detail worth noting is that Lenovo installed a thermal pad and copper sheet between the metal back cover and the SSD, which allows the heat generated by the SSD to be quickly discharged, avoiding the performance loss caused by overheating.
SSD Cover

The memory is designed on-board and cannot be replaced. The machine we got is a dual-channel 16GB DDR4-2666 memory, and the top version can reach 32GB capacity.
RAM

The wireless network card uses Intel’s latest AX200, which supports the Wi-Fi 6 protocol and Bluetooth 5.0.
wireless network card

The battery capacity is 59Wh. Of course, the battery life of a notebook with a standard processor will not be too considerable. Using the original charger can fully charge 80% in one hour. Under Power long-life mode, local 1080P video playback time is about 4-5 hours at 50% brightness.
battery

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