Intel Core i5-2405S Review

Introduction and Technical Specifications

Intel Core i5-2405S Review


The latest in the LGA1155 line of CPUs is the i5-2405S. Whilst many processors get bigger and better with more speed, ever tinier nm processes etc, this is squarely aimed at the energy efficient, low-power end of the market.

With a TDP of only 65W and a clock speed of 2.5GHz this is either a serious attempt to lower the energy consumption of businesses or, like the famed 65W E6800, a potential powerhouse.

Let's find out which one it is shall we.

Technical Specifications

A quick glance through the specification table and we see that this is pretty much a standard Core i5 processor. We have four non-HT cores, a bit of Turbo performance boost, all very standard fare. 

The big change with the i5-2405S compared to, for example, the Core i5-2500K we use in our Sandy Bridge bench rig is the much tighter multiplier restrictions that limit overclocking potential and the obvious reduction from a TDP of 95W to 65W.

Launch DateQ2'11
Processor Numberi5-2405S
# of Cores4
# of Threads4
Clock Speed2.5 GHz
Max Turbo Frequency3.3 GHz
Bus/Core Ratio25
Instruction Set64-bit
Instruction Set ExtensionsSSE4.1/4.2, AVX
Embedded Options AvailableNo
Lithography32 nm
Max TDP65 W
Recommended Channel Price$205.00
# of Memory Channels2
Max Memory Bandwidth21 GB/s
ECC Memory SupportedNo
Processor GraphicsIntel® HD Graphics 3000
Graphics Base Frequency850 MHz
Graphics Max Dynamic Frequency1.1 GHz
Intel® Quick Sync VideoYes
Intel® InTru™ 3D Technology,Yes
Intel® Insider™Yes
Intel® Wireless DisplayNo
Intel® Flexible Display Interface (Intel® FDI)Yes
Intel® Clear Video HD TechnologyYes
Dual Display CapableYes
Max CPU Configuration1
Package Size37.5mm x 37.5mm
Sockets SupportedFCLGA1155, LGA1155
Low Halogen Options AvailableYes
Intel® Turbo Boost Technology2.0
Intel® vPro TechnologyNo
Intel® Hyper-Threading TechnologyNo
Intel® Virtualization Technology (VT-x)Yes
Intel® Virtualization Technology for Directed I/O (VT-d)No
Intel® Trusted Execution TechnologyNo
AES New InstructionsYes
Intel® 64Yes
Idle StatesYes
Enhanced Intel SpeedStep® TechnologyYes
Thermal Monitoring TechnologiesYes
Intel® Fast Memory AccessYes
Intel® Flex Memory AccessYes
Execute Disable BitYes
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Most Recent Comments

31-08-2011, 06:02:33

The latest in a long line of SandyBridge processors is the low power Core i5-2405S. We put it to the test.

Continue ReadingQuote

31-08-2011, 06:17:02

Seems pretty pointless to release this when it offers nothing but a lower TDP and who would buy this when you can get the 2500k for the same money which you can also overclock

Even if you don't go for the 2500k the non K 2500 is still cheaper and faster than the 2405S.Quote

31-08-2011, 07:24:06

There's also the i5 2500T as well which is only 45W, but that's even more expensive than the 2500K.Quote

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