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Yes, Legion 5 Pro has two NVMe PCIe 3.0 2280 SSD slots, the second slot is empty and has a pre-installed heatsink with a thermal pad. (I installed Samsung 970 Evo 1TB
Lenovo Legion 5 Pro Disassembly (RAM, M.2 SSD upgrade options)
Lenovo Legion 5 Pro Disassembly (RAM, M.2 SSD upgrade options)