Yonah (microprocessor)

Yonah is the code name of Intel's first generation 65 nm process CPU cores, based on cores of the earlier Banias (130 nm) / Dothan (90 nm) Pentium M microarchitecture. Yonah CPU cores were used within Intel's Core Solo and Core Duo mobile microprocessor products. SIMD performance on Yonah improved through the addition of SSE3 instructions and improvements to SSE and SSE2 implementations; integer performance decreased slightly due to higher latency cache. Additionally, Yonah included support for the NX bit. The Intel Core Duo brand referred to a low-power (less than 25 watts) dual-core microprocessor, which offered lower power operation than the competing AMD Opteron 260 and 860 HE at 55 watts. Core Duo was released on January 5, 2006, with the other components of the Napa platform. It was the first Intel processor to be used in Apple Macintosh products (although the Apple Developer Transition Kit machines, non-production units distributed to some developers, used Pentium 4 processors). There were two variants and one derivative of the Yonah, which did not bear the "Intel Core" brand name: A dual-core (server) derivative, code-named Sossaman, was released on March 14, 2006, as the Xeon (branded) LV (low-voltage). The Sossaman differed from the Yonah only in its support for dual-socket configurations (two CPUs providing a total of four cores per motherboard, like AMD Quad FX), and implementation of 36-bit memory addressing (PAE mode). A single-core variant, code-named Yonah-1024, was released as the Celeron (branded) M 400 series CPUs. It was largely identical to the Core Solo branded Yonah, except that it only had half the L2 cache and did not support SpeedStep and Intel VT-x. Another dual-core variant of Yonah was branded as Pentium Dual-Core T2060, T2080, and T2130 mobile CPUs with Intel VT-x support. Core Duo contains 151 million transistors, including the shared 2 MB L2 cache. Yonah's execution core contains a 12-stage pipeline, forecast to eventually be able to run at a maximum frequency of 2.33–2.50 GHz.

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