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Merom is the codename for Intel's mobile version of the 65nm Core 2 processor line. Intel began shipping Merom to manufacturers alongside Conroe (the desktop version) on July 27 2006. Variants of Merom is used in all Macs apart from the Mac Pro.


Core Microarchitecture

Like Conroe and Woodcrest, the Merom processor is based on Intel's new Core Microarchitecture.

Merom is similar to the 32-bit Core Duo (codenamed Yonah), but supports 64-bit memory addressing, 64-bit integer operations, additional registers under programmatic control when operating in 64-bit mode, larger L2 cache in the faster models, improved vector processing units (now single cycle), more advanced branch prediction, and the ability to dispatch and retire more instructions per cycle. Intel claims it offers 20% better performance at the same clock speed when compared to Yonah.

The first version of Merom is pin compatible with Yonah and backwards compatible with the Napa Centrino motherboard. To install Merom in a Napa system, the worst that would be required is a BIOS/EFI update, otherwise the processor ID might not be properly reported to your operating system. New power management features might not be fully implemented as well. Still, this did not prevent users from installing prototype and engineering samples of the chips in Macs.[1]

Santa Rosa

A second wave of Merom processors was launched in May 2007 featuring an 800 MT/s FSB and using the new Socket P. These chips are part of the new Centrino Duo platform code-named Santa Rosa.[2] Santa Rosa pairs the updated Merom with the Crestline chipset, derived from the desktop 965 series. It comes in the GM965 and PM965 versions.[3] The new platform sports 802.11n wireless, Robson flash technology, and the updated GMA X3000.[4]


AnandTech has conducted some benchmarks on Merom. The benchmarks are carried out on the same laptop. The processors were simply swapped for each test. Merom worked fine in the laptop even though the BIOS did not have the proper processor ID.

Geek Patrol has conducted benchmarks of the original iMac Core Duo vs. the iMac Core 2 Duo using Geekbench. Overall Merom shows a 10% gain in performance. has done an exhaustive review of the Dell XPS 1710 and the Intel Core 2 Duo T7600G.

Core 2 Duo - "Merom" (64-bit, dual-core)

Model Clock Speed Front Side Bus Multiplier L2 Cache TDP Socket Release Date Price (USD) Notes
Core 2 Duo T52001.60 GHz533 MHz12x2 MiB34WSocket M2006 Oct?
Core 2 Duo T53001.73 GHz533 MHz13x2 MiB34WSocket M2007 Q1?
Core 2 Duo T55001.67 GHz667 MHz10x2 MiB34WSocket M2006 Aug$209
Core 2 Duo T56001.83 GHz667 MHz11x2 MiB34WSocket M2006 Aug$241
Core 2 Duo T71001.80 GHz800 MHz9x2 MiB35WSocket P2007 May$209
Core 2 Duo L72001.33 GHz667 MHz8x4 MiB17WFCBGA62007 Q2$284
Core 2 Duo T72002.00 GHz667 MHz12x4 MiB34WSocket M2006 Aug$294
Core 2 Duo T73002.00 GHz800 MHz10x4 MiB35WSocket P2007 May$241
Core 2 Duo L74001.50 GHz667 MHz9x4 MiB17WFCBGA62007 Q2$316
Core 2 Duo T74002.16 GHz667 MHz13x4 MiB34WSocket M2006 Aug$423
Core 2 Duo T75002.20 GHz800 MHz11x4 MiB35WSocket P2007 May$315
Core 2 Duo T76002.33 GHz667 MHz14x4 MiB34WSocket M2006 Aug$637
Core 2 Duo T7600G2.33 GHz667 MHz14x4 MiB35WSocket M2006 Dec?Overclocks to 3.16 GHz[5]
Core 2 Duo T77002.40 GHz800 MHz12x4 MiB35WSocket P2007 May$529
Core 2 Duo X7800[6]2.6 GHz800 MHz13x4 MiB44WSocket P2007 Q3$851Page 1 News[7]
Core 2 Duo X79002.80 GHz800 MHz14x4 MiB44WSocket P2007 Aug?Page 1 News [8]


Gilo is the successor to Merom. It is based off of the 65nm process and reportedly a multi-core mobile processor. Speculation points to a quad core processor. [9]

See also

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