Intel Core i5 661 

Released January, 2010
  • 3.33 GHz
  • Dual core
6.9 Out of 10

As far as the media performance if the Intel Core i5-600 line, it is going to be tough to beat.
by Legit Reviews (Jan, 2010)
With an expected street price of $100, this board supports any Corei3 or i5 (LGA 1156) CPU, though the i5-750 will need a graphics card installed.
by Legit Reviews (Jan, 2010)

CPUBoss Review Our evaluation of the Intel Core i5 661 among desktop CPUs (over 75W)


Benchmark performance using all cores

Core i5 661
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

Core i5 661
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Core i5 661
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

Core i5 661
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Core i5 661
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


Are you paying a premium for performance?

Core i5 661
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more


CPUBoss Score

Combination of all six facets

Core i5 661

Benchmarks Real world tests of the Intel Core i5 661

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i5 661
Core i7 870
Core i5 750

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i5 661
Core i5 750
Core i7 870

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i5 661
1,600,000 MB/s
Core i5 750
127,600 MB/s
Core i7 870
142,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i5 661
Core i7 870
Core i5 750

GeekBench (64-bit) Data courtesy Primate Labs

Core i5 661
Core i7 870
Core i5 750


Core i5 661
Core i7 870
Core i5 750

PassMark Data courtesy Passmark

Core i5 661
Core i7 870
Core i5 750

PassMark (Single Core)

Core i5 661
Core i5 750
Core i7 870

Reviews Word on the street for the Intel Core i5 661

Exceptionally quick for a dual-core processor, it also packs a graphics core integrated into the processor package itself.

What People Are Saying Give it to me straight

Socket Type

In our first gaming benchmark, the i5-661 holds the tiniest of performance advantage over the i5-750.
by Legit Reviews (Jan, 2010)
It offers full decoding for H.264, VC-1, and MPEG2.
by Legit Reviews (Jan, 2010)
With the shrink to 32nm, we were excited to see how far we could crank the CPU speed up with reasonable voltage.
by Legit Reviews (Jan, 2010)


iTunes only makes use of 2 threads for the encoding to MP3 here, so with a higher clock speed the i5-661 outpaced the i5-750 by 6 seconds!
by Legit Reviews (Jan, 2010)
It is important to keep that in mind as you look at the price list above, as 3 of the CPU’s listed are equal to, or more expensive than the Core i5-750 CPU, which is a 4 Core/4 Thread part.
by Legit Reviews (Jan, 2010)
In the middle is the HDMI 1.3 interface.
by Legit Reviews (Jan, 2010)


It has been a long time coming, but Intel has finally brought Nehalem performance to the small form factors.
by Legit Reviews (Jan, 2010)
Sandra 2010c has a dedicated benchmark built-in that measure cryptographic performance, which is important on the new Intel Arrandale processors like the Core i5 540M that we are benchmarking today include features like AES-NI!
by Legit Reviews (Jan, 2010)
Results: The Intel Core i5-661 blows away its bigger, more powerful brother in the AES benchmark, while the i5-750 holds an advantage in the Hashing test.
by Legit Reviews (Jan, 2010)


Yes, it has a graphics core integrated into the CPU package.
by Tech Radar (Sep, 2010)
But it's a decidedly feeble graphics core of little value to gamers.
by Tech Radar (Sep, 2010)
For a dual-core processor, it's awesome.
by Tech Radar (Sep, 2010)


When asked, Intel responded by saying “Intel is working with key software players to enable Blu-ray Stereo 3D on Intel graphics.
by Legit Reviews (Jan, 2010)
But the fact remains this latest integrated graphics core from Intel is effectively worthless for gaming.
by Tech Radar (Sep, 2010)
While it isn't ideal for gaming, the Intel HD Graphics passes itself off nicely.
by Legit Reviews (Jan, 2010)

Specifications Full list of technical specs


Clock speed 3.33 GHz
Turbo clock speed 3.6 GHz
Cores Dual core
Socket type LGA 1156
Is unlocked No


Has a NX bit Yes
Supports trusted computing No
Has virtualization support Yes
Instruction set extensions
  1. MMX
  2. AES
  3. SSE
  4. SSE2
  5. SSE4.1
  6. SSE3
  7. Supplemental SSE3
  8. SSE4.2
  9. SSE4
Supports dynamic frequency scaling Yes

power consumption

Annual home energy cost 36.95 $/year
Annual commercial energy cost 96.71 $/year
Performance per watt 6.04 pt/W
Idle power consumption 67W
Peak power consumption 110.4W
Typical power consumption 99.55W


Architecture DMI
Transfer rate 2,500 MT/s


Architecture x86-64
Threads 4 threads
L2 cache 1 MB
L2 cache per core 0.5 MB/core
L3 cache 4 MB
L3 cache per core 2 MB/core
Manufacture process 32 nm
Transistor count 382,000,000
Max CPUs 1
Clock multiplier 25
Voltage range 0.65 - 1.4V
Operating temperature Unknown - 69.8°C


Overclocked clock speed 4.66 GHz
Overclocked clock speed (Water) 3.33 GHz
Overclocked clock speed (Air) 4.66 GHz

integrated graphics

Label Intel® HD Graphics
Number of displays supported 2
GPU clock speed 900 MHz

memory controller

Memory controller Built-in
Memory type
  1. DDR3-1333
  2. DDR3-1066
  3. DDR3
Channels Dual Channel
Maximum bandwidth 21,333.32 MB/s
Maximum memory size 16,773.12 MB
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