Intel Celeron (Socket 478); Main Memory; Ddr-Sdram - Compaq Evo D510 e-pc Technical Reference Manual

Intel Celeron (Socket 478)

The "new" Celeron (socket 478) processor is based on the Pentium 4 architecture. It is supported
by the Intel 845G chipset. The "new" Celeron processor also features the following:
■
Processor speeds ranging from 1.7 to 1.8 GHz at the time of initial product release
■
Front side bus 400 MHz
■
128 KB or 256 KB cache

Main Memory

There are two memory module slots on the system board for installing main memory. You
can install 266 MHz DDR-SDRAM modules; these are available in 128, 256, 512 MB and
1 GB memory modules. You can install a maximum of 2 GB of memory (2 x 1 GB modules).
You can only use non-ECC memory modules.

DDR-SDRAM

Short for Double Data Rate-Synchronous DRAM, DDR-SDRAM is a type of SDRAM that
supports data transfers on both edges of each clock cycle, effectively doubling the memory chip's
data throughput. DDR-SDRAM also consumes less power. DDR-SDRAM is also called
SDRAM II.
While the new memory module is clocked at the same speed as normal SDRAM, it is able to
transport double the amount of data by using the rising as well as falling edge of the clock signal
for data transfers. DDR-SDRAM has another important enhancement over SDRAM. Its voltage
supply uses only 2.5 V, instead of 3.3 V. This and the lower capacities inside the memory chips
lead to significantly reduced power consumption.
DDR-SDRAM DIMMs are not compatible with SDRAM DIMMs. The new DDR-DIMMs come
with 184 instead of the 168 pins used by SDRAM-DIMMs. The module itself looks almost
identical to SDRAM, but it has only one notch on its connector surface.
Technical Reference Guide
DIMM slots
System Features
2–7