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Intel® Xeon® and Intel® Itanium® processors

Intel® Xeon® and Intel® Itanium® processor numbers are categorized in four digit numerical sequences, and may have an alpha prefix to indicate power and performance.

Alpha Prefix ———————————— Description
X ———————————— Performance
E ———————————— Mainstream (rack-optimized)
L ———————————— Power-Optimized

Intel® Xeon® and Intel® Itanium® processor families and their number sequence

Processor Family Number Sequence ———————————— System Type
Intel® Itanium® processor ———————————— 9000 Multi-processor and dual-processor
Intel® Xeon® processor ———————————— 7000 Multi-processor
Intel® Xeon® processor ———————————— 5000 Dual-processor
Intel® Xeon® processor ———————————— 3000 Single-processor

Intel® Atom™ processors

Processor numbers for the Intel® Atom™ processor family are categorized by a three digit numerical sequence. Netbook class Intel® Atom™ processors have an alpha prefix of N, and Intel Atom processors with an alpha prefix of Z indicate the processor is for Mobile Internet Devices (MIDs).

A higher number within a processor class or family generally indicates more features. A higher processor number may have more of one feature and less of another.

Intel® Celeron® processors

Processor numbers for the Intel® Celeron® brand are expressed with either a three digit numerical sequence or a five character sequence with an alphabetical prefix and four digits, depending on the processor type.

A higher number within a processor class or family generally indicates more features such as cache, clock speed, Front Side Bus or other Intel technologies¹. A higher number processor may also have more of one feature and less of another.

Intel® Pentium® processors

Processor numbers for the Intel Pentium brand have an alpha prefix followed by a four character numerical sequence. All are desktop energy-efficient dual-core processors with TDP that is greater than or equal to 65W.

A higher number within a processor class or family generally indicates more features such as cache, clock speed, Front Side Bus or other Intel technologies¹. A higher number processor may also have more of one feature and less of another.

Intel® Core™ processors

Processor numbers for the Intel® Core™ processor family have an alpha/numerical identifier followed by a three digit numerical sequence.

A higher number within a processor class or family generally indicates more features, including: cache, clock speed, Front Side Bus, Intel® QuickPath Interconnect, new instructions, or other Intel technologies¹. A higher processor number may also have more of one feature and less of another.

Processor numbers for the Intel® Core™2 processor family brands are categorized with an alpha prefix followed by a four digit numerical sequence. The table below explains the alpha prefixes used for the Intel Core 2 processor families.

Alpha Prefix Description
QX Desktop or mobile quad-core extreme performance processors
X Desktop or mobile dual-core extreme performance processors
Q Desktop quad-core high performance processors
E Desktop energy efficient dual-core processors with TDP greater than or equal to 55W
T Mobile highly energy efficient processors with TDP 30-39W
P Mobile highly energy efficient processor with TDP 20-29 W
L Mobile highly energy efficient with TDP 12-19W
U Mobile ultra high energy efficient with TDP less than or equal to 11.9W
S Mobile small form-factor with 22×22 BGA package

Processor numbers for the Intel® Core™2 Quad family have an alpha prefix followed by a four digit numerical sequence. Additionally, low power Intel Core 2 Quad processors are identifiable by an “S” suffix which represents processors having a lower thermal design power.

The processor number is one of several factors, along with processor brand, specific system configurations and system-level benchmarks, to be considered when choosing the right processor for your computing needs.

Intel processor numbers are based on a variety of features that may include the processor’s underlying architecture, cache, Front Side Bus, clock speed, power and other Intel technologies¹. A processor number represents a broad set of features that can influence overall computing experience but is not a measurement of performance.

A higher number within a processor class or family generally indicates more features, but it may be more of one and less of another. Once you decide on a specific processor brand and type, compare processor numbers to verify the processor includes the features you are looking for.

Intel’s processor number system is used with the following brands:

# Intel® Core® processors

* Intel® Core™ i7 processor Extreme Edition
* Intel® Core™ i7 processor
* Intel® Core™2 Extreme processor
* Intel® Core™2 Quad processor
* Intel® Core™2 Duo processor

# Intel® Pentium® processors

* Intel® Pentium® processor

# Intel® Celeron® processors

* Intel® Celeron® processor

# Intel® Atom™ processors

* Intel® Atom™ processors

# Intel® Xeon® and Itanium® processors

* Intel® Xeon® processor 7000 sequence
* Intel® Xeon® processor 5000 sequence
* Intel® Xeon® processor 3000 sequence
* Intel® Itanium® processor