Lenovo NetVista Hardware Maintenance Manual (HMM) for NetVista 6832 and 6833 s - Page 133

Memory(RIMM) Your computer has four connectors for Rambus inline memory modules (RIMMs) that provide up to a maximum of 1.5 GB of system memory. The IBM-installed RIMMs that come with your computer are ECC (error checking and correction) Rambus dynamic random access memory (RDRAM) modules. When installing or replacing RIMMs, take the following information into consideration: • Rambus memory is divided into two channels (channel A and B). RIMM connectors 1 and 3 are channel A, and RIMM connectors 2 and 4 are channel B. • Each channel must contain the same amount of memory. • Each RIMM connector supports a maximum of 512 MB of memory. • Any connector that does not have a RIMM installed must have a continuity RIMM (CRIMM), a module that looks like a RIMM but has no memory on it. A C-RIMM is used to continue the connection on a RIMM connector that does not have memory installed in it. • Install only ECC RIMMs to enable ECC. If you use ECC and non-ECC memory together, it will function as non-ECC memory. • RIMM connectors do not support dual in- line memory modules (DIMMs). • Use only PC600 or PC800 RIMMs. NOTE: If you use PC600 and PC800 RIMMs together, all memory will function at the speed of the slowest RIMM. Removing a RIMM or C-RIMM To remove a RIMM or C-RIMM: 1.To locate the RIMM connectors inside your computer. General Information 101