“Upgrade the RAM later” applies only to some laptops. A thin machine may have memory soldered to the board, while another has one or more SODIMM slots. Two laptops with 16GB today can therefore offer different flexibility in a few years. Read the documentation for the exact model before comparing prices.
1. Distinguish soldered memory from a slot
Technical documentation often says “soldered” when memory is built onto the system board and “SODIMM slot” when a removable module can be installed. Some machines combine both types. DDR4, DDR5 and LPDDR5x describe memory technology, not by themselves whether a user can replace it.
A slot still requires a compatible generation, supported speed and capacity. Opening a laptop may affect warranty conditions or present installation risks, so ask the seller or an authorised service centre before buying a module.
2. Read the exact model code
Use the specific machine code on the listing to find manufacturer documents. Compare the Memory, Memory Slots and Max Memory rows, then read the notes. A stated maximum may reflect tested or offered configurations, not universal compatibility with every module for sale.
Lenovo documents a DDR5 SODIMM slot for the IdeaPad Slim 3 16IWC11 family, whereas ThinkPad X13 Gen 5 uses soldered LPDDR5x memory and has no slot. Those are design choices, not a verdict that one is better for every buyer.
3. Base the choice on real software
Documents and light calls differ from layered design work, virtual machines or large data sets. Run your normal apps together and check memory use in Windows Task Manager. If RAM regularly approaches its limit and the system relies on disk for temporary memory, more RAM may help more than a CPU change.
Neither 8GB nor 16GB is an absolute threshold for everyone. Software and habits change. A fixed-memory laptop needs headroom for the period you expect to keep it; a slot offers a later option but does not excuse choosing a poor configuration today.
4. Include the real upgrade cost
When two configurations differ in price, add the compatible module, labour and time. A machine with one slot may require replacing its current stick with a larger one rather than adding a second stick. Confirm what is installed and how service affects warranty.
SSD and RAM upgrade paths are separate. A replaceable SSD does not imply replaceable RAM, and an available RAM slot does not prove there is a second SSD bay. Check each specification independently.
5. Two listed designs illustrate the decision
TECHBUY lists an 8GB IdeaPad Slim 3 16IWC11 and a 16GB ThinkPad X13 Gen 5. Lenovo documents a SODIMM slot for the former family and fixed RAM for the latter. Confirm upgradeability on the exact unit before deciding.
If a compact computer with enough fixed memory meets your needs, soldered RAM may be fine. If workloads could grow, a slot offers flexibility. Include screen, weight, ports and budget in the final choice.
Conclusion
RAM upgradeability belongs to a specific design and configuration. Sources: Lenovo IdeaPad Slim 3 16IWC11 PSREF and ThinkPad X13 Gen 5 PSREF.
