Bonjour @GEM and welcome Manufacturer brands are usually not mentioned here, all commercially available ones are suitable. You can upgrade the RAM to a maximum of 64 GB. equal pairs are recommended. 8 GB DDR4 SO-DIMM (PC4-25600 / 3200 MHz) is now installed and an SSD / M.2 (2280) 512 GB Phision PCIe GEn 4x4. you can install another SSD M.2 PCIe GEN 3x4. Your computer is a barebone Clevo NP70PNJ (-M). Here you will find a service manual which describes how to disassemble it. load NP70PNHPNJPNK SM(20221222).zip https://my.hidrive.com/share/yze8mg-wf8#$/CLEVO%20Service%20Manual%20Books/2010/N_Series/NP/NPxxPNK_J_H au revoir/bye Fishtown
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