Technology And Components; Ddr4; Key Specifications - Dell OptiPlex 5260 Service Manual

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Table of Contents

This chapter details the technology and components available in the system.

Topics:

•

DDR4

•

USB features

•

HDMI

DDR4

DDR4 (double data rate fourth generation) memory is a higher-speed successor to the DDR2 and DDR3 technologies and allows up to 512

GB in capacity, compared to the DDR3's maximum capacity of 128 GB per DIMM. DDR4 synchronous dynamic random-access memory is

keyed differently from both SDRAM and DDR to prevent the user from installing the wrong type of memory into the system.

DDR4 needs 20 percent less or just 1.2 volts, compared to DDR3 which requires 1.5 volts of electrical power to operate. DDR4 also supports

a new, deep power-down mode that allows the host device to go into standby without needing to refresh its memory. Deep power-down

mode is expected to reduce standby power consumption by 40 to 50 percent.

Key Specifications

The following table lists the specifications' comparison between DDR3 and DDR4:

Table 1. DDR3 vs DDR4

Feature/Option

Chip Densities

Data rates

Voltage

Low voltage standard

Internal banks

Bank groups (BG)

VREF inputs

tCK — DLL Enabled

tCK — DLL Disabled

Read Latency

Write Latency

DQ Driver (ALT)

DQ Bus