Pentium Dual-Core

This article is about Pentium Dual-Core branded processors from 2006 to 2009. For current and other Pentium processors, see Pentium.

Pentium Dual-Core

Produced	From 2006 to 2009
Common manufacturer(s)	Intel
Max. CPU clock rate	1.3 GHz to 2.6 GHz
FSB speeds	533 MHz to 800 MHz
Min. feature size	65 nm to 45 nm
Instruction set	MMX, SSE, SSE2, SSE3, SSSE3, x86-64
Microarchitecture	Core
Cores	2
Socket(s)	LGA 775 Socket M Socket P
Core name(s)	Yonah Merom-2M Allendale Wolfdale-3M

The Pentium Dual-Core brand was used for mainstream x86-architecture microprocessors from Intel from 2006 to 2009 when it was renamed to Pentium. The processors are based on either the 32-bit Yonah or (with quite different microarchitectures) 64-bit Merom-2M, Allendale, and Wolfdale-3M core, targeted at mobile or desktop computers.

In terms of features, price and performance at a given clock frequency, Pentium Dual-Core processors were positioned above Celeron but below Core and Core 2 microprocessors in Intel's product range. The Pentium Dual-Core was also a very popular choice for overclocking, as it can deliver high performance (when overclocked) at a low price.

Processor cores

In 2006, Intel announced a plan^[1] to return the Pentium trademark from retirement to the market, as a moniker of low-cost Core microarchitecture processors based on the single-core Conroe-L but with 1 MiB of cache. The identification numbers for those planned Pentiums were similar to the numbers of the latter Pentium Dual-Core microprocessors, but with the first digit "1", instead of "2", suggesting their single-core functionality. A single-core Conroe-L with 1 MiB cache was deemed as not strong enough to distinguish the planned Pentiums from the Celerons, so it was replaced by dual-core CPUs, adding "Dual-Core" to the line's name. Throughout 2009, Intel changed the name back from Pentium Dual-Core to Pentium in its publications. Some processors were sold under both names, but the newer E5400 through E6800 desktop and SU4100/T4x00 mobile processors were not officially part of the Pentium Dual-Core line.

Intel Pentium Dual-Core processor family
Original Logo	Rebranded Logo	Desktop			Laptop
		Code-named	Core	Date released	Code-named	Core	Date released
		Allendale Wolfdale	dual (65 nm) dual (45 nm)	Jun 2007 Aug 2008	Yonah Merom Penryn	dual (65 nm) dual (65 nm) dual (45 nm)	Jan 2007 Nov 2007 Dec 2008
List of Intel Pentium Dual-Core microprocessors

Yonah

Main article: Yonah (microprocessor)

The first processors using the brand appeared in notebook computers in early 2007. Those processors, named Pentium T2060, T2080, and T2130,^[2] had the 32-bit Pentium M-derived Yonah core, and closely resembled the Core Duo T2050 processor with the exception of having 1 MB of L2 cache instead of 2 MB. All three of them had a 533 MHz FSB connecting the CPU with the memory. Intel developed the Pentium Dual-Core at the request of laptop manufacturers.^[3]

Allendale

Main article: Conroe (microprocessor)#Allendale

Subsequently, on June 3, 2007, Intel released the desktop Pentium Dual-Core branded processors^[4] known as the Pentium E2140 and E2160.^[5] An E2180 model was released later in September 2007. These processors support the Intel 64 extensions, being based on the newer, 64-bit Allendale core with Core microarchitecture. These closely resembled the Core 2 Duo E4300 processor with the exception of having 1 MB of L2 cache instead of 2 MB.^[2] Both of them had an 800 MHz FSB. They targeted the budget market above the Intel Celeron (Conroe-L single-core series) processors featuring only 512 KB of L2 cache. Such a step marked a change in the Pentium brand, relegating it to the budget segment rather than its former position as the mainstream/premium brand.^[6] These CPUs are highly overclockable.^[7]

Merom-2M

Main article: Merom (microprocessor)#Merom-2M

The mobile version of the Allendale processor, the Merom-2M, was also introduced in 2007, featuring 1MB of L2 cache but only 533 MT/s FSB with the T23xx processors. The bus clock was subsequently raised to 667 MT/s with the T3xxx Pentium processors that are made from the same dies.

Wolfdale-3M

Main article: Wolfdale (microprocessor)#Wolfdale-3M

The 45 nm E5200 model was released by Intel on August 31, 2008, with a larger 2MB L2 cache over the 65 nm E21xx series and the 2.5 GHz clock speed. The E5200 model is also a highly overclockable processor, with some enthusiasts reaching over 6 GHz^[8] clock speed using liquid nitrogen cooling. Intel released the E6500K model using this core. The model features an unlocked multiplier, but is currently only sold in China.

Penryn-3M

Main article: Penryn (microprocessor)#Penryn-3M

The Penryn core is the successor to the Merom core and Intel's 45 nm version of their mobile series of Pentium Dual-Core microprocessors. The FSB is increased from 667 MHz to 800 MHz and the lower voltage is lowered. Intel released the first Penryn based Pentium Dual-Core, the T4200, in December 2008. Later, mobile Pentium T4000, SU2000 and SU4000 processors based on Penryn were marketed as Pentium.

Rebranding

See also: Pentium

The Pentium Dual-Core brand has been discontinued in early 2010 and replaced by the Pentium name. The Desktop E6000 series and the OEM-only mobile Pentium SU2000 and all later models were always called Pentium, but the Desktop Pentium Dual-Core E2000 and E5000 series processors had to be rebranded.

Comparison to the Pentium D

Although using the Pentium name, the desktop Pentium Dual-Core is based on the Core microarchitecture, which can clearly be seen when comparing the specification to the Pentium D, which is based on the NetBurst microarchitecture first introduced in the Pentium 4. Below the 2 or 4 MiB of shared-L2-cache-enabled Core 2 Duo, the desktop Pentium Dual-Core has 1 or 2 MiB of shared L2 Cache. In contrast, the Pentium D processors have either 2 or 4 MiB of non-shared L2 cache. Additionally, the fastest-clocked Pentium D has a factory boundary of 3.73 GHz, while the fastest-clocked desktop Pentium Dual-Core reaches 3.2 GHz. A major difference among these processors is that the desktop Pentium Dual Core processors have a TDP of only 65 W while the Pentium D ranges between 95 to 130 W.

See also

• Pentium
• List of Intel Pentium Dual-Core microprocessors
• List of Intel Pentium microprocessors

References

1. ^ DailyTech – Intel "Conroe-L" Details Unveiled
2. ^ ^{a b} "Intel Pentium E2140 & E2160 review". TechSpot. http://www.techspot.com/review/53-pentium-e2140-e2160/. Retrieved 2007-06-23. 
3. ^ dawn of mulit-core era – The multicore era is upon us
4. ^ "Pentium E/Celeron 400 to be releasing on June 3". HKEPC Hardware. http://www.hkepc.com/bbs/itnews.php?tid=755292. Retrieved 2007-03-16. ^{[dead link]}
5. ^ Shilov, Anton. "Intel Readies Pentium E2000-Series Processors". X-bit labs. http://www.xbitlabs.com/news/cpu/display/20061115223825.html. Retrieved 2007-03-04. 
6. ^ Intel Processor Numbers chart for Intel Pentium Dual-Core processors
7. ^ Schmid, Patrick (12 September 2007). "$89 Pentium Dual Core that Runs at 3.2 GHz". Tom's Hardware. http://www.tomshardware.com/reviews/pentium-dual-core,1683.html. Retrieved 2009-09-21. 
8. ^ http://ripping.org/database.php?cpuid=858