Lenovo ThinkPad T15 Gen 2

The Lenovo ThinkPad T15 Gen 2 uses a hybrid memory architecture combining 16 GB of factory-soldered memory with 1 accessible SO-DIMM expansion slot. Documented specifications list a maximum system capacity of 48 GB running DDR4-3200. Because the primary memory chips are permanently bonded to the motherboard, your expansion ceiling depends on installing a single compatible SO-DIMM module into the open socket without exceeding the chipset's per-slot addressing limit.

To preserve dual-channel memory performance on the Lenovo ThinkPad T15 Gen 2, match the clock speed, voltage, and CAS latency of the onboard DDR4-3200 memory as closely as possible. When the installed SO-DIMM matches the soldered bank capacity, the memory controller runs in symmetric dual-channel mode, boosting integrated GPU frame pacing and multitasking responsiveness. Exceeding the soldered size still expands total capacity through asymmetric flex mode, though peak bandwidth remains strongest on matched pairs.

For storage expansion, the Lenovo ThinkPad T15 Gen 2 provides 1 M.2 slot supporting M.2 2280 drives over PCIe 3.0 x4 NVMe with tested configurations supporting up to 2 TB per drive. PCIe NVMe interfaces are backward- and forward-compatible across generations, so a Gen 4 SSD safely runs at Gen 3 speeds in a Gen 3 bay—though picking a drive matching your chassis length (M.2 2280) is strictly required for the mounting standoff to align.

High-throughput NVMe SSDs generate substantial heat during sustained file transfers or OS cloning. Check whether your Lenovo ThinkPad T15 Gen 2 includes a factory thermal pad or thin copper heat spreader on the bottom cover or SSD bay, and avoid bulky aftermarket desktop heatsinks that prevent the slim laptop bottom panel from seating flush.