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The First Mobile Dual-Core

Intel's 15 Most Unforgettable x86 CPUs

In 2006, Intel announced the Core Duo. The first dual-core processor for portable PCs boasted excellent performance—much better than the Pentium 4. It was also one of the first x86 processors to be truly dual-core. The cache, for example, is shared (whereas the Pentium D was more like an assembly of two processors in the same package). This processor was part of the Centrino Duo platform and was a huge success. The only drawback was that it was still a 32-bit processor, unlike the Pentium 4.

Intel Core Duo
Code name Yonah
Date released 2006
Architecture 32 bits
Data bus 64 bits
Address bus 32 bits
Maximum memory 4 GB
L1 cache 32 KB + 32 KB
L2 cache 2,048 KB shared
Clock frequency 1.06–2.33 GHz
FSB 667 MHz
SMT/SMP Dual core
Fabrication process 65 nm
Number of transistors 151 million
TDP 9-31 W
Voltage 0.9–1.3 V
Die surface area 91 mm²
Connector Socket 479

A Core Solo version with one core was also made available, and the low-power-consumption versions used a 533 MHz bus (133 MHz QDR) instead of 667 MHz. This processor was used in servers (code name Sossaman), which was a first for a processor originally intended for the mobile world. Note that this processor didn’t officially use the Core architecture of the Core 2 Duo, and it was quickly replaced by the Core 2 Duo (Merom) in portable PCs. Also, the Yonah’s Socket 479 is different from the Socket 479 of other Pentium M processors.

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