Dell Precision T5500 (Early 2009) User Manual

Page 2

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About Memory

Dell Precision™ T5500 Service Manual

Memory Modules

Supported Memory Configurations

Memory Subsystem

Memory Slots

Memory Population Rules

Your computer uses 1066 MHz and 1333Mhz DDR3 unbuffered or registered ECC SDRAM memory. DDR3 SDRAM, or double-data-rate three synchronous
dynamic random access memory, is a random access memory technology. It is a part of the SDRAM family of technologies, which is one of many DRAM (dynamic
random access memory) implementations, and is an evolutionary improvement over its predecessor, DDR2 SDRAM.

The primary benefit of DDR3 SDRAM is its ability to run its I/O bus at four times the speed of the memory cells it contains, thus enabling faster bus speeds and
higher peak throughputs than earlier technologies. This is achieved at the cost of higher latency. Also, the DDR3 standard allows for chip capacities of 512
megabit to 8 gigabit, effectively enabling memory modules of maximum 16 gigabyte in size.

DDR3 memory comes with a promise of a power consumption reduction of 30% compared to current commercial DDR2 modules due to DDR3’s 1.5 V supply
voltage. This supply voltage works well with the 90 nm fabrication technology used for most DDR3 chips. Some manufacturers further propose to use "dual-
gate" transistors to reduce leakage of current.

The main benefit of DDR3 comes from the higher bandwidth made possible by DDR3’s 8 bit deep prefetch buffer, whereas DDR2’s is 4 bits, and DDR’s is 2 bits
deep.

Memory Modules

Supported Memory Configurations

WARNING:

Before working inside your computer, read the safety information that shipped with your computer. For additional safety best

practices information, see the Regulatory Compliance Homepage at www.dell.com/regulatory_compliance.

Standard name

Memory clock

Cycle time

I/O Bus clock

Data transfers per second

Module name

Peak transfer rate

DDR3-1066

133 MHz

7.5 ns

533 MHz

1066 Million

PC3-8500

8533 MB/s

DDR3-1333

166 MHz

6 ns

667 MHz

1333 Million

PC3-10600

10667 MB/s

Single Processor Memory Configurations

Size

(GB)

DIMM

Ranks

DIMM1

DIMM2

DIMM3

DIMM4

DIMM5

DIMM6

1 GB

2 GB

1 GB

2 GB

1 GB

2 GB

4 GB

8 GB

4 GB

8 GB

Dual CPU Memory Configurations

Size

(GB)

DIMM

Ranks

MB DIMM1

MB DIMM2

MB DIMM3

MB DIMM4

MB DIMM5

MB DIMM6

Riser DIMM1

Riser DIMM2

Riser DIMM3

1 GB

2 GB

1 GB

2 GB

1 GB

2 GB

4 GB

2 GB

4 GB

8 GB

4 GB

8 GB

4 GB

8 GB

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