LENOVO IdeaPad S740 RAM upgrade specifications

The Lenovo IdeaPad S740 laptop features DDR4-SDRAM memory with two SO-DIMM slots supporting maximum RAM capacity of 16 GB. Memory upgrade specifications are compatible with DDR4-2666 MHz modules. The SO-DIMM form factor enables memory expansion on this Lenovo S series model. Maximum supported memory capacity reaches 16 GB total across available slots.

Additional Notes

• The Lenovo IdeaPad S740 restricts total system memory to 16 GB across both slots, requiring either a single 16 GB module or dual 8 GB modules for maximum capacity.
• DDR4-2666 operates at PC4-21300 bandwidth specification, delivering 21.3 GB/s theoretical throughput per channel in single-channel configuration or 42.6 GB/s in dual-channel mode.
• Installing a single module instead of matched pairs forces single-channel operation, reducing memory subsystem bandwidth by approximately 50 percent compared to dual-channel configuration.
• The SO-DIMM form factor measures 67.6 mm in length versus 133.35 mm for standard desktop DIMMs, preventing compatibility with full-size memory modules.
• Modules rated above 2666 MHz will downclock to match the system's maximum supported frequency, offering no performance advantage despite higher specifications.
• Mixing memory modules with different CAS latencies may force the system to operate at the slower timing values, potentially degrading performance versus matched modules.
• Accessing internal SO-DIMM slots typically requires bottom panel removal, which may involve breaking manufacturer seals that affect warranty coverage depending on regional service policies.
• Non-ECC unbuffered modules represent the only compatible DDR4 variant, as registered or error-correcting memory types operate under different electrical specifications incompatible with consumer chipsets.
• Systems configured with soldered memory alongside SO-DIMM slots reduce available upgrade capacity, though this model's 2x SO-DIMM specification suggests both slots remain user-accessible.
• Operating voltage remains standardized at 1.2V for DDR4 specifications, eliminating concerns about low-voltage or high-performance variant compatibility within the 2666 MHz speed grade.