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About Memory
Dell Precision™ T7500 Service Manual
Memory Modules
Supported Memory Configurations
Memory Subsystem
Memory Slots
Memory Population Rules
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.
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
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
Supported Memory Configurations
Single Processor Memory Configurations
Size
(GB)
DIMM
Ranks
DIMM1 DIMM2 DIMM3 DIMM4 DIMM5 DIMM6
3 SR 1 GB 1 GB 1 GB
4 SR 1 GB 1 GB 1 GB 1 GB
4 MR 2 GB 1 GB 1 GB 1 GB
6 SR 2 GB 2 GB 2 GB
8 MR 2 GB 2 GB 2 GB 1 GB 1 GB
12 SR 2 GB 2 GB 2 GB 2 GB 2 GB 2 GB
12 DR 4 GB 4 GB 4 GB
24 DR 4 GB 4 GB 4 GB 4 GB 4 GB 4 GB
24 DR 8 GB 8 GB 8 GB
32 MR 8 GB 8 GB 4 GB 4 GB 4 GB 4 GB
48 DR 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB
96 QR 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB