Intel Core i5 655K 

Released April, 2010
  • 3.2 GHz
  • Dual core
  • Unlocked

If you're really into overclocking, you might like the extra opportunity afforded by the unlocked multiplier on the Core i5-655K.
by PCMag (May, 2010)
Intel's Nehalem CPU architecture is a scorcher in quad and six-core trim and it makes for an impressive in dual-core chip, too.
by Tech Radar (Sep, 2010)

Benchmarks Real world tests of the Intel Core i5 655K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i5 655K
Core i3 3220
Core i5 650

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i5 655K
Core i3 3220
Core i5 650

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i5 655K
1,570,000 MB/s
Core i3 3220
173,000 MB/s
Core i5 650
1,550,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i5 655K
Core i3 3220
Core i5 650


Core i5 655K
Core i3 3220
Core i5 650

PassMark Data courtesy Passmark

Core i5 655K
Core i3 3220
Core i5 650

PassMark (Single Core)

Core i5 655K
Core i3 3220
Core i5 650

Reviews Word on the street for the Intel Core i5 655K

The 655K has a tough time justifying its existence.

What People Are Saying Give it to me straight


Unfortunately, dual-core computing hasn't been cutting edge since 2006.
by Tech Radar (Sep, 2010)
If dual-core computing was state of the art, this chip would be our weapon of choice.
by Tech Radar (Sep, 2010)
The Core i5 655K therefore costs too much and delivers too little processor performance compared to similarly priced quad and six-core alternatives.
by Tech Radar (Sep, 2010)

Socket Type

Otherwise, both the CPUs boast a fairly standard range of Intel features, including Turbo Boost (a sort of automatic overclocking that dynamically increases clock speed when you have the headroom for it), Hyper-Threading for doubling the number of threads in applications that support it, Intel Smart Cache, an integrated dual-channel DDR-1333 memory controller (with support for XMP memory), and compatibility with all P55-, H57, and H55-based chipsets.
by PCMag (May, 2010)
System builders may not want to pay $40 more for overclocking privileges with only a dual-core chip.
by PCMag (May, 2010)
What's more, you get an integrated graphics core built into the CPU itself (note, however, that not all LGA1,156 motherboards will support the graphics functions).
by Tech Radar (Sep, 2010)


Now, however, things are changing with Intel's release of the Core i7-875K ($342 list, ) and the Core i5-655K ($216 list).
by PCMag (May, 2010)
For that you can thank HyperThreading, which allows the Core i5 665K to simulate the presence of an extra pair of cores.
by Tech Radar (Sep, 2010)
The models are functionally identical to the Lynnfield-based Core i7-870 and the Clarkdale Core i5-650—the primary difference being these chips' unlocked multipliers.
by PCMag (May, 2010)


But enthusiasts with overclocking ambitions haven't had much choice.
by PCMag (May, 2010)
It also runs cool, uses little power and overclocks well.
by Tech Radar (Sep, 2010)
Both the new CPUs will be launching at Computex in Taiwan next week, but we got our hands on both ahead of time and tested them to see just how well they lived up to their overclocking promise.
by PCMag (May, 2010)


All of which leaves us wondering whether the 655K's unlocked processor multiplier can make the difference.
by Tech Radar (Sep, 2010)

Specifications Full list of technical specs


Clock speed 3.2 GHz
Turbo clock speed 3.46 GHz
Cores Dual core
Socket type LGA 1156
Is unlocked Yes


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 17.59 $/year
Annual commercial energy cost 63.95 $/year
Performance per watt 8.89 pt/W
Typical power consumption 59.31W


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 24
Voltage range 0.65 - 1.4V
Operating temperature Unknown - 72.6°C


Overclock popularity 4
Overclocked clock speed 4.63 GHz
Overclocked clock speed (Water) 3.2 GHz
Overclocked clock speed (Air) 4.63 GHz

integrated graphics

Label Intel® HD Graphics
Number of displays supported 2
GPU clock speed 733 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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