Lenovo PC 300PL Techical Information Manual - Page 13

Chapter 2. System board features System memory The system memory interface is controlled by the Intel 820 chip set. Rambus dynamic random access memory (RDRAM) is standard. The maximum amount of addressable system memory is 1 GB. For memory expansion, the system board provides two Rambus inline memory module (RIMM) connectors. The system board also supports PC700 memory and PC800 memory RIMMs in sizes of 64 MB, 128 MB, 256 MB, and 512 MB. The amount of memory that is preinstalled varies by model. The following information applies to system memory: ECC or non-ECC RDRAM is standard. The maximum height of memory modules is 6.35 cm (2.5 in.). Each memory connector supports a maximum of 512 MB of memory, when available. Install only ECC RIMMS to enable ECC. If you use ECC and non-ECC memory together, all installed memory will function as non-ECC memory. RIMM connectors do not support dual inline memory modules (DIMMs). Any connector that does not have a RIMM installed must have a continuity RIMM (C-RIMM), a module that looks like a RIMM but has no memory on it. A continuity RIMM is used to continue the connection on a RIMM connector that does not have memory installed in it. Use PC700 or PC800 RIMMs only. Maximum system memory can be auto-detected and auto-configured using serial presence detect and configuration interface (BIOS specific). The following table shows the possible configuration of RIMMs and continuity RIMMs that can be used in the PC 300PL Personal Computer. Figure 1. Memory configurations for 133 MHz FSB RIMM 1 RIMM 2 PC700 PC700 PC700 PC800 PC700 C-RIMM PC800 PC800 PC800 C-RIMM C-RIMM C-RIMM Any RIMM No RIMM No RIMM No RIMM No RIMM C-RIMM Functions as PC700 PC700 PC700 PC800 PC800 Invalid Invalid Invalid Invalid For information on the pin assignments for the memory-module connectors, see "Memory connectors" on page 26. Chapter 2. System board features 5