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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 22x22 BGA package
N Network platform