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Technical Reference Guide
3.3 MEMORY SUBSYSTEM
These systems provide two 184-pin DIMM sockets that accept DDR DIMMs. The D315 models
ship with PC2100 DIMMs while the d325 models ship with PC2700 DIMMs.
NOTE: The DDR SDRAM DIMM "PCxxxx" reference designates bus bandwidth (i.e.,
a PC2100 DIMM, operating at a 266-MHz effective speed, provides a throughput of
2100 MBps (8 bytes × 266 MHz)).
These systems support DIMMs with the following specifications:
♦ Unbuffered, non-ECC with SPD rev. 1.0
♦ CL (CAS latency) = 2, 2.5, or 3
♦ Single or double-sided
The following table lists the differences in DIMM support between the D315 and the D325
models:
D315 d325
DIMM Type (max speed) PC2100 (266-MHz) PC2700 (333-MHz)
Highest technology level supported 512 Mb 1024 Mb
Maximum amount supported 1 GB 2 GB
The SPD format as supported in this system (SPD rev. 1) is shown in Table 3-1. All DIMMs must
yield a value of 07h (indicating DDR memory) in SPD byte 02 (i.e., only DDR DIMMs are
supported in these systems).
The memory subsystem is controlled by the memory controller integrated into the IGP component
of the NVidia NForce chipset. The D315 model supports a 64-bit wide memory array with a
maximum capacity of up to 1-GB using 512-Mb memory technology. The d325 model provides
(with two DIMMs installed) a 128-bit wide memory array with a maximum capacity of 2 GB
using 1-Mb memory technology.
NOTE: Non-supported DIMMs will not be recognized by the BIOS during the boot
sequence and therefore not be used.
Compaq D315 and hp d325 Personal Computers
Featuring the AMD Athlon XP Processor
Second Edition - April 2003
3-5