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Differences What are the advantages of each

Front view of Intel Core i5 655K

Reasons to consider the
Intel Core i5 655K

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Much lower typical power consumption 59.31W vs 112.55W More than 45% lower typical power consumption
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Much lower annual home energy cost 17.59 $/year vs 41.29 $/year 2.3x lower annual home energy cost
Much lower annual commercial energy cost 63.95 $/year vs 110.03 $/year More than 40% lower annual commercial energy cost
Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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More cores 4 vs 2 Twice as many cores; run more applications at once
Supports more RAM 32,768 MB vs 16,773.12 MB Supports more than 95% more RAM
Higher clock speed 3.3 GHz vs 3.2 GHz Around 5% higher clock speed
Much better overclocked clock speed (Air) 4.98 GHz vs 4.63 GHz Around 10% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.88 GHz vs 3.2 GHz Around 55% better overclocked clock speed (Water)
Newer Jan, 2011 vs Apr, 2010 Release date 9 months later

Benchmarks Real world tests of Core i5 655K vs 2500K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i5 655K
1,570,000 MB/s
Core i5 2500K
2,530,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Reviews Word on the street

Specifications Full list of technical specs

summary

Core i5 655K  vs
2500K 
Clock speed 3.2 GHz 3.3 GHz
Turbo clock speed 3.46 GHz 3.7 GHz
Cores Dual core Quad core
Socket type
LGA 1156
LGA 1155
Is unlocked Yes Yes

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 73W 95W
Annual home energy cost 17.59 $/year 41.29 $/year
Annual commercial energy cost 63.95 $/year 110.03 $/year
Performance per watt 8.89 pt/W 6.79 pt/W
Typical power consumption 59.31W 112.55W

bus

Architecture DMI DMI
Number of links 1 1
Transfer rate 2,500 MT/s 5,000 MT/s

details

Core i5 655K  vs
2500K 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.25 MB/core
L3 cache 4 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 32 nm
Transistor count 382,000,000 1,160,000,000
Max CPUs 1 1
Clock multiplier 24 33
Voltage range 0.65 - 1.4V 1.2 - 1.5V
Operating temperature Unknown - 72.6°C 5 - 72.6°C

overclocking

Overclock popularity 4 3,179
Overclocked clock speed 4.63 GHz 4.98 GHz
Overclocked clock speed (Water) 3.2 GHz 4.88 GHz
Overclocked clock speed (Air) 4.63 GHz 4.98 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics 3000
Number of displays supported 2 2
GPU clock speed 733 MHz 850 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 16,773.12 MB 32,768 MB
Intel Core i5 655K
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Intel Core i5 2500K
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