Personal Computer User Manual
Chapter 2. System board features
System memory
The system memory interface is controlled by the Intel 82810 chip set. PCI 100 synchronous dynamic
random access memory (SDRAM) is standard.
The maximum amount of system memory is 512 MB. For memory expansion, the system board provides
two dual inline memory module (DIMM) connectors. 100 MHz DIMMs in sizes of 32 MB, 64 MB, 128 MB,
and 256 MB are supported. The amount of memory preinstalled varies by model.
The following information applies to system memory:
SDRAM, nonparity, unbuffered, 3.3V memory is standard.
The maximum height of memory modules is 6.35 cm (2.5 in.).
Only PC 100 industry-standard, gold-contact DIMMs are supported.
The PC 300GL does not support error correcting code (ECC).
Auto-configure, auto-detect maximum system memory, using serial presence detect and configuration
interface (BIOS specific).
For information on the pin assignments for the memory module connectors, see “Memory connectors” on
page 25.
The following figure shows some possible configurations for the supported DIMMs.
Note: Values in the following table are represented in megabytes (MB).
Figure 1. Memory configurations
Total memory (MB) DIMM 0 DIMM 1
32 32 0
64 32 32
64 64 0
96 64 32
128 64 64
128 128 0
160 128 32
192 128 64
256 128 128
384 256 128
512 256 256
PCI bus
The fully synchronous 33 MHz PCI bus originates in the Intel 82801 chip. Features of the PCI bus are:
Integrated arbiter with multitransaction PCI arbitration acceleration hooks
Zero-wait-state, microprocessor-to-PCI write interface for high performance graphics
Built-in PCI bus arbiter with support for up to five masters
Microprocessor-to-PCI memory write posting with 5-Dword-deep buffers
Converts back-to-back sequential microprocessor-to-PCI memory write to PCI burst write
PCI-to-DRAM posting 18 Dwords
PCI-to-DRAM up to 100+ MB/sec bandwidth
Multitransaction timer to support multiple short PCI transactions within one PCI ARB cycle
PCI 2.2/2.3 compliant
4 Technical Information Manual