The LENOVO 01K1138 module consists of a 128MB PC100 SDRAM (Synchronous Dynamic Random Access Memory) DIMM (Dual In-line Memory Module), designed for desktop computers that require PC100, 100MHz memory. This memory module offers a substantial upgrade for older desktops, allowing users to enhance their system's performance and capability to run applications more smoothly. It is perfect for extending the life of legacy systems, providing a cost-effective way to increase the multitasking capabilities and overall responsiveness of the computer. As a genuine Lenovo part, the 01K1138 ensures compatibility and reliable operation, giving users peace of mind when upgrading their systems.