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Merom (microprocessor)

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Title: Merom (microprocessor)  
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Subject: Intel Core, Penryn (microprocessor), Conroe (microprocessor), List of Intel microprocessors, MacBook Air
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Merom (microprocessor)

Produced From 2006 to 2009
Max. CPU clock rate 1.6 GHz to 2.6 GHz
FSB speeds 533 MHz to 800 MHz
Instruction set x86_64 (64-bit)
Microarchitecture Core
CPUID code 06Fx (Merom-L: 1066x)
Product code 537
Cores 2 (Merom-L: 1)
L2 cache Merom: 4 MiB
Merom-2M: 2 MiB
Merom-L: 1 MiB
Application Mobile
Brand name(s)
  • Mobile Celeron 5xx
  • Mobile Celeron Dual-Core E1xxx
  • Mobile Pentium Dual-Core T2xxx
  • Mobile Pentium Dual-Core T3xxx
  • Core 2 Duo T5xxx
  • Core 2 Duo T7xxx
  • Core 2 Duo L7xxx
  • Core 2 Solo U2xxx

Merom is the code name for various Intel processors that are sold as Core 2 Duo, Core 2 Solo, Pentium Dual-Core and Celeron. It was the first mobile processor to be based on the Core microarchitecture, replacing the Enhanced Pentium M based Yonah processor. Merom has product code 80537, which is shared with Merom-2M and Merom-L that are very similar but have a smaller L2 cache. Merom-L has only one processor core and a different CPUID model. The desktop version of Merom is Conroe and the dual-socket server version is Woodcrest. Merom has subsequently been replaced by Penryn.


Processor Brand name Model (list) Cores L2 Cache Socket TDP
Merom-L Mobile Core 2 Solo U2xxx 1 2 MiB BGA479 5.5 W
Merom-2M Mobile Core 2 Duo U7xxx 2 2 MiB BGA479 10 W
Merom L7xxx 4 MiB 17 W
2-4 MiB Socket M
Socket P
35 W
Merom Mobile Core 2 Extreme X7xxx 2 4 MiB Socket P 44 W
Merom Celeron M (Socket M) and Celeron (Socket P) 5x0 1 1024 KiB Socket M
Socket P
30 W
Merom-L 5x0 27 W
Merom-2M 5x5 1024 KiB Socket P 31 W
Merom-L 5x3 512-1024 KiB BGA479 5.5-10 W
Merom-2M Celeron Dual-Core T1xxx 2 512-1024 KiB Socket P 35 W
Merom-2M Pentium Dual-Core T2xxx
2 1 MiB Socket P 35 W


Merom, the first mobile version of the Core 2, was officially released on July 27, 2006 but quietly began shipping to PC manufacturers in mid-July alongside Conroe.[1][2] Merom became Intel's premier line of mobile processors, with mostly the same features of Conroe, but with more emphasis on low power consumption to enhance notebook battery life. Merom-based Core 2 Duo provides a slight performance increase associated with 3D rendering and media encoding tasks [1], yet maintains the same battery life as the Yonah-based Core Duo. Merom is the first Intel mobile processor to feature Intel 64 architecture.

The first version of Merom is "drop-in" compatible with Napa platform for Core Duo, requiring at most a motherboard BIOS update. It has a similar thermal envelope of 34 W and the same 667 MT/s FSB rate.[3] The Merom die features 4 MB L2 cache, half of which is deactivated in the T5xx0 CPUs. A native 2 MB L2 version of the Merom core, called Merom-2M, was rolled out in early 2007 as a counterpart to Allendale. The Merom-2M core uses the steppings L2 and M0 and the ultra-low-voltage versions of the Core 2 Duo use this core.

A second wave of Merom processors featuring an 800 MT/s FSB and using the new Socket P was launched on May 9, 2007.[4] These chips are part of Santa Rosa platform.[5] Low voltage versions were also released on May 9, 2007.

Merom (מרום) is the Hebrew word for a higher plane of existence or a level of heaven, BaMerom (במרום) means "in the heavens". The name was chosen by the Intel team in Haifa, Israel, who designed this processor.

Merom XE

The Core 2 Extreme Mobile processor, based on the Merom XE core, is a mobile CPU designed for laptops. It was released in two models, the X7900 and the X7800. These feature an 800 MT/s FSB. The X7800, introduced on July 16, 2007,[6] is clocked at 2.6 GHz and costs around $851 for OEMs. The processor features a 44 W TDP and requires the new Intel Centrino (Santa Rosa) platform. The X7900, introduced on August 22, 2007, is clocked at 2.8 GHz.

The X7900 processor was used in the top-end iMacs released on August 7, 2007.


The mobile version of the Allendale desktop processor is often called Merom-2M to identify the smaller L2 cache. Some T5xxx and T7xxx processors have come out with both Merom and Merom-2M dies, which can only be distinguished through their stepping number.


The Merom-L processor is based on the same model as Conroe-L but is used in mobile Socket M and Socket P systems as Celeron 5xx and Core 2 Solo U2xxx, some of which also use regular Merom and Merom-2M chips with one core disabled in contrast to the real Merom-L that only has 1 MB L2 cache and a single core. The CPUID is family 6 model 23 (10661h), which is between Merom and Penryn.

The first Core 2 Solo processors were launched in Q3 2007 and consisted of the U2100 and U2200, which run at 1.06 and 1.2 GHz, respectively. They both feature a 533 MT/s FSB and are part of Intel's ULV family, running at only 5 W. Like the rest of the Core 2 family, they are 64-bit compatible. They were released with compatibility for the Napa platform rather than the newer Santa Rosa platform due to power consumption concerns.[7]

See also


  1. ^
  2. ^
  3. ^
  4. ^
  5. ^
  6. ^
  7. ^

External links

  • List of Intel processors codenamed Merom
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