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Intel Core i5-655K - CM80616003174AO / BX80616I5655K

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Core i5-655K is the first desktop Core i5 microprocessor with unlocked clock multiplier. Built on enhanced Nehalem micro-architecture, this dual-core processor operates at 3.2 GHz, includes 4MB level 3 cache and supports AES instructions and streaming SIMD extensions up the SSE4. Two important performance enhancement features in this model are HyperThreading, which improves processor's performance in multi-threaded applications, and Turbo Boost technology, that temporary boosts performance by raising frequency of active cores.

Basic features of the Core i5-655K CPU are very similar to Core i5-650, but there are a few differences. The 655K model has unlocked clock multiplier, while the 650 model doesn't. Also, the i5-655K doesn't feature Virtualization for Directed I/O (VT-d) and Trusted Execution Technology. Like all current Core i5 microprocessors, the i5-655K is packaged in 1156-land LGA package compatible with socket 1156 motherboards. Boxed version of the i5-655K microprocessor uses updated design with large "UNLOCKED" text on the front of the box. Distinct from 6x0 boxed CPUs, the 655K box doesn't include a fan/heatsink. At launch the processor was priced at $216, or $40 more than the i5-650. According to first reviews, the microprocessor may be overclocked up to 4 GHz on air, and up to 4.5 GHz when water cooling is used.

Intel Core i5-655K specifications

General information
TypeCPU / Microprocessor
Market segmentDesktop
FamilyIntel Core i5
Model number  ? i5-655K
CPU part numbersCM80616003174AO is an OEM/tray microprocessor
BX80616I5655K is a boxed processor (English version)
Frequency  ? 3200 MHz
Turbo frequency3467 MHz (1 core)
3333 MHz (2 cores)
Package1156-land Flip-Chip Land Grid Array (FC-LGA10)
1.48" x 1.48" (3.75 cm x 3.75 cm)
SocketSocket 1156 / H1 / LGA1156
Weight0.9oz / 24.3g (CPU)
4.1oz / 117.3g (box)
Introduction dateJune 1, 2010
End-of-Life dateLast order date is February 24, 2012
Last shipment date for tray processors is August 10, 2012
Price at introduction$216
S-spec numbers
  ES/QS processors Production processors
Part number Q4MA SLBXL
BX80616I5655K +
Architecture / Microarchitecture
MicroarchitectureNehalem (Westmere)
Processor core  ? Clarkdale
Core stepping  ? K0 (SLBXL)
Manufacturing process0.032 micron
382 million transistors (CPU die)
177 million transistors (IMC / graphics die)
Die size81mm2 (CPU die)
114mm2 (IMC / graphics die)
Data width64 bit
The number of cores2
The number of threads4
Floating Point UnitIntegrated
Level 1 cache size  ? 2 x 32 KB instruction caches
2 x 32 KB data caches
Level 2 cache size  ? 2 x 256 KB
Level 3 cache size4 MB shared cache
Cache latency4 (L1 cache)
10 (L2 cache)
39 (L3 cache)
  • MMX instructions
  • SSE / Streaming SIMD Extensions
  • SSE2 / Streaming SIMD Extensions 2
  • SSE3 / Streaming SIMD Extensions 3
  • SSSE3 / Supplemental Streaming SIMD Extensions 3
  • SSE4 / SSE4.1 + SSE4.2 / Streaming SIMD Extensions 4  ? 
  • AES / Advanced Encryption Standard instructions
  • EM64T / Extended Memory 64 technology / Intel 64  ? 
  • VT-x / Virtualization technology  ? 
  • NX / XD / Execute disable bit  ? 
  • TBT / Turbo Boost technology  ? 
  • HT / Hyper-Threading technology  ? 
Low power features
  • Thread C1, C3 and C6 states
  • Core C1/C1E, C3 and C6 states
  • Package C1/C1E, C3 and C6 states
  • Enhanced SpeedStep technology  ? 
Integrated peripherals / components
Integrated graphics
  • GPU Type: HD (Nehalem)
    Base frequency (MHz): 733
Memory controller
  • The number of controllers: 1
    Memory channels: 2
    Supported memory: DDR3-1333
Other peripheralsDirect Media Interface
Electrical / Thermal parameters
Thermal Design Power  ? 73 Watt
Notes on Intel CM80616003174AO
  • Graphics processor and memory controller are located on a separate die, which is manufactured on 0.045 micron technology
  • Unlocked clock multiplier

Detailed side-by-side comparison

For detailed comparision of the Intel i5-655K and any other other chip from our CPU database type in a chip name and/or its partial specs:

You can specify any of the following: manufacturer name, family name, model number, part number, core name, socket name, operating frequency, bus speed, and the last level cache. Here are examples of searches: i5-655K, CM80616003174AO, Intel Core i5 3.2GHz, Clarkdale Socket 1156

Historical price chart

The chart below shows official prices of Intel Core i3-540, i3-2100, i3-2105, i3-550, i5-650, i5-655K, i3-560, i3-2120 and i3-3210 processors:

Historical official prices of Core i3-540, i3-2100, i3-2105, i3-550, i5-650, i5-655K, i3-560, i3-2120 and i3-3210 processors


Q: I have an Intel Core i5-655K microprocessor. Can I upgrade it?
A: Probably yes. CPU compatibility is determined by your motherboard. Please see website for CPU support list for your board.

Core i5-655K Overclocking

Sorry, overclocking information is not available at this time.

Related news stories

Intel to discontinue socket 1156 "K" CPUs, embedded chips
Aug 07, 2011: A few days ago, Intel published Product Change Notifications (PCN) documents, where it disclosed plans to discontinue several socket 1156 processors in 2012. Core i5-760, as well as two unlocked "K" models, Core i5-655K and Core i7-875K, will be available for order until February 24, 2012. Last week, Intel also announced discontinuation of a large number of embedded microprocessors.

Intel added pricing for new Core i3/ i5 / i7 microprocessors
Jun 01, 2010: On May 27th we posted a news story about new Intel processors coming this quarter - Xeon X3480, Pentium Dual-Core E6700, Core I3-550, and unlocked Core i5 I5-655K and Intel Core I7-875K CPUs. All these models, as well as Core i7-880, were listed in today's Intel price list.

Reviews of Core i5-655K and Core i7-875K unlocked microprocessors
May 29, 2010: Non-Disclosure Agreement for i5-655K and i7-875K processors was lifted yesterday, May 28, and many sites posted reviews of these two CPUs. Most of the reviewed microprocessors were engineering samples, or, to be more exact, qualification samples.

Intel microprocessors planned for this quarter
May 27, 2010: We discovered information about new Intel desktop and server microprocessors, planned for this quarter, in a leaked Intel document. The document lists 6 new desktop processors and one server CPU.

Core i5-655K and Core i7-875K are in stock
May 19, 2010: On May 7th we posted news about pre-order of Core i5-655K and Core i7-875K microprocessors. It seems that the processors are now in stock.

Core i7-875K and Core i5-655K are available for pre-order
May 07, 2010: Core i7-875K and Core i5-655K are 32nm microprocessors with unlocked core multiplier that are expected next month. Both CPUs are based on enhanced Nehalem micro-architecture, and feature Turbo Boost and HyperThreading technologies.

Compare Intel i5-655K benchmark results with all tested CPUs from one of the following families:

To compare this Core i5 CPU with any tested processor please proceed to

For additional benchmarks, comparing multi-threaded performance of this microprocessor with other Core i5 CPUs and the fastest AMD and Intel x86 chips, please visit Intel Core i5-655K benchmarks page.

Intel i5-655K Benchmarks

The graphs below show up to 10 microprocessors with approximately the same level of integer (CPU), floating-point (FPU), SIMD and memory performance. All processors were not overclocked, and were tested at a nominal frequency, with a stock heatsink and default BIOS settings. Click on the '?' mark next to each model name to see specifications of that model, and details of the test platform. To find out how the i5-655K compares to other CPUs in specific benchmarks or in aggregate milti-threading performance please see benchmark tools section on the right.

Benchmarked processor

S-spec number:SLBXL
CPU ID:0655h
CPU vendor string:GenuineIntel
CPU name string:Intel(R) Core(TM) i5 CPU K 655 @ 3.20GHz

Integer performance

Part number   Result
AMD Athlon II X3 440 (rev. C3)  ? 
AMD Athlon II X3 440 (rev. C2)  ? 
AMD A8-6500B  ? 
Intel Core i5-650  ? 
AMD A8-6500  ? 
Intel Core i5-655K  ? 
Intel Core i3-560  ? 
AMD A10-5700  ? 
Intel Core i5-3320M (PGA)  ? 
Intel Core i5-2520M (PGA)  ? 
AMD Athlon II X3 435 (rev. C3)  ? 

Floating Point performance

Part number   Result
Intel Core i5-661  ? 
Intel Core i5-660  ? 
Intel Core i3-3225  ? 
Intel Core i3-3220  ? 
Intel Core i5-3360M (PGA)  ? 
Intel Core i5-655K  ? 
Intel Core i3-560  ? 
Intel Core i7-720QM  ? 
AMD A6-3650  ? 
AMD Athlon II X4 631  ? 
AMD Phenom II X4 810  ? 

MMX / SSE / SSE2 performance

Part number   Result
AMD Athlon II X4 641  ? 
AMD A10-6700  ? 
Intel Core i5-661  ? 
Intel Core i5-660  ? 
Intel Core i5-2390T  ? 
Intel Core i5-655K  ? 
AMD Phenom II X4 830  ? 
AMD Phenom II X4 925 (rev. C3)  ? 
AMD Phenom II X4 B93  ? 
Intel Core i3-560  ? 
AMD Phenom II X4 925 (rev. C2)  ? 

Memory-intensive program performance

Part number   Result
Intel Core 2 Duo E8400  ? 
AMD Phenom II X3 740  ? 
AMD A8-3870K  ? 
Intel Core i5-2410M (PGA)  ? 
AMD Athlon II X4 651K  ? 
Intel Core i5-655K  ? 
Intel Core i5-650  ? 
AMD A8-5500  ? 
AMD A8-3850  ? 
AMD Phenom II X4 650T  ? 
Intel Core 2 Duo E8300  ? 

CPU ID information for the Core i5-655K

Search or browse all public submissions in our CPUID database.

Use our CPU identification tool to check features of your CPU.

NOTE: The CPU ID information below was taken from one CPU and may include features that are not present in all different steppings of the Intel Core i5 i5-655K CPU.

CPU Family:Core i5
Processor Number:i5-655K
Frequency:3210 MHz
Part number:
S-Spec Number:SLBXL
Submitted by:CPU-World
General information
Processor name (BIOS):Intel(R) Core(TM) i5 CPU K 655 @ 3.20GHz
Logical processors:4
Processor type:Original OEM Processor
CPUID signature:20655
Family: 6 (06h)
Model:37 (025h)
Stepping: 5 (05h)
TLB/Cache details:64-byte Prefetching
Data TLB0: 2-MB or 4-MB pages, 4-way set associative, 32 entries
Data TLB: 4-KB Pages, 4-way set associative, 64 entries
Instruction TLB: 2-MB or 4-MB pages, fully associative, 7 entries
Instruction TLB: 4-KB pages, 4-way set associative, 64 entries
Shared 2nd-level TLB: 4 KB pages, 4-way set associative, 512 entries

Cache: L1 data L1 instruction L2 L3
Size: 2 x 32 KB 2 x 32 KB 2 x 256 KB 4 MB
Associativity: 8-way set
4-way set
8-way set
16-way set
Line size: 64 bytes 64 bytes 64 bytes 64 bytes
Comments: Direct-mapped Direct-mapped Non-inclusive
Shared between all cores
Instruction set extensionsAdditional instructions
Major featuresOther features
On-chip Floating Point Unit 36-bit page-size extensions
64-bit / Intel 64 64-bit debug store
NX bit/XD-bit Advanced programmable interrupt controller
Hyper-Threading Technology CPL qualified debug store
Intel Virtualization Debug store
Turbo Boost Debugging extensions
Enhanced SpeedStep Digital Thermal Sensor capability
  LAHF / SAHF support in 64-bit mode
  Machine check architecture
  Machine check exception
  Memory-type range registers
  Model-specific registers
  Page attribute table
  Page global extension
  Page-size extensions (4MB pages)
  Pending break enable
  Perfmon and Debug capability
  Physical address extensions
  Process context identifiers
  TSC rate is ensured to be invariant across all states
  Thermal monitor
  Thermal monitor 2
  Thermal monitor and software controlled clock facilities
  Time stamp counter
  Virtual 8086-mode enhancements
  xTPR Update Control

CPUs, related to Intel Core i5-655K

Model Cores /
Frequency Turbo
TDP Features  
Intel Core i5 family, Socket 1156
   Core i5-6502 / 43.2 GHz3.46 GHz4 MB73WSSE4, AES, HT, TXT, TBT, Unlock>
   Core i5-655K2 / 43.2 GHz3.46 GHz4 MB73WSSE4, AES, HT, TBT, Unlock 
   Core i5-6612 / 43.33 GHz3.6 GHz4 MB87WSSE4, AES, HT, TBT, Unlock>
   Core i5-6602 / 43.33 GHz3.6 GHz4 MB73WSSE4, AES, HT, TXT, TBT, Unlock>
   Core i5-6702 / 43.46 GHz3.73 GHz4 MB73WSSE4, AES, HT, TXT, TBT, Unlock>
   Core i5-6802 / 43.6 GHz3.86 GHz4 MB73WSSE4, AES, HT, TXT, TBT, Unlock>
   Core i5-750S4 / 42.4 GHz3.2 GHz8 MB82WSSE4, AES, HT, TBT, Unlock>
   Core i5-7504 / 42.66 GHz3.2 GHz8 MB95WSSE4, AES, HT, TBT, Unlock>
   Core i5-7604 / 42.8 GHz3.46 GHz8 MB95WSSE4, AES, HT, TBT, Unlock>
Other families, Nehalem micro-architecture, Socket 1156
   Pentium G69502 / 22.8 GHz 3 MB73WSSE4, AES, HT, TBT, Unlock>
   Pentium G69512 / 22.8 GHz 3 MB SSE4, AES, HT, TBT, Unlock>
   Pentium G69602 / 22.93 GHz 3 MB73WSSE4, AES, HT, TBT, Unlock>
   Core i3-5302 / 42.93 GHz 4 MB73WSSE4, AES, HT, TBT, Unlock>
   Core i3-5402 / 43.06 GHz 4 MB73WSSE4, AES, HT, TBT, Unlock>
   Core i3-5502 / 43.2 GHz 4 MB73WSSE4, AES, HT, TBT, Unlock>
   Core i3-5602 / 43.33 GHz 4 MB73WSSE4, AES, HT, TBT, Unlock>
   Core i7-8704 / 82.93 GHz3.6 GHz8 MB95WSSE4, AES, HT, TXT, TBT, Unlock>
   Core i7-875K4 / 82.93 GHz3.6 GHz8 MB95WSSE4, AES, HT, TBT, Unlock>
   Core i7-8804 / 83.06 GHz3.73 GHz8 MB95WSSE4, AES, HT, TXT, TBT, Unlock>
 • Highlighted numbers and features indicate whether specific processor performs better or worse than the Core i5-655K
 • Within each category, the CPUs are sorted from slower (at the top) to faster (at the bottom)
 • Click on the >  icon to compare any CPU in the table with the Intel Core i5-655K (Javascript required).
 • List of related CPUs is not complete.
 • Features abbreviations:
SSE4 - SSE4 instructions
AES - AES instructions
HT - Hyper-Threading
TXT - Trusted Execution
TBT - Dynamic Acceleration / Turbo Boost
Unlock - Unlocked multiplier

Pictures (8)

2010-07-15 23:18:17
Posted by: gshv

2010-07-15 23:18:42
Posted by: gshv

2010-07-15 23:19:03
Posted by: gshv

Intel Core i5-655K box
2010-07-15 23:25:50
Posted by: gshv

The box has the same size as Pentium 6500K unlocked microprocessor, but different (newer) design. Width and height of the box are the same as for other boxed locked Core i5 CPUs, and the depth is about 1/2 of the depth of locked boxed processors. The smaller size of the box is possible because it doesn't come with the fan/heatsink.
Intel Core i5-655K box
2010-09-23 23:36:57
Posted by: gshv

Bottom view
Intel Core i5-655K CPU picture
2010-09-23 23:41:21
Posted by: gshv

Top view. S-Spec code SLBXL. The processor manufactured in the middle of February 2010. The markings on the CPU are "3.20GHZ/4M/09A".
Intel Core i5-655K CPU picture
2012-04-25 17:26:28
Posted by: gshv

CPU-Z screenshot
2012-04-25 17:30:43
Posted by: gshv

CPU-Z screenshot of Core i5-655K, overclocked to 4 GHz. Default voltage, stock fan/heatsink.
Comments (0)

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