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Differences What are the advantages of each

Front view of Intel Core i7 875K

Reasons to consider the
Intel Core i7 875K

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
More cores 4 vs 2 Twice as many cores; run more applications at once
Front view of Intel Core i5 660

Reasons to consider the
Intel Core i5 660

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly higher clock speed 3.33 GHz vs 2.93 GHz Around 15% higher clock speed
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly lower typical power consumption 59.31W vs 77.19W Around 25% lower typical power consumption
Significantly better overclocked clock speed (Air) 4.28 GHz vs 4.1 GHz Around 5% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.86 GHz vs 4.09 GHz Around 20% better overclocked clock speed (Water)
Significantly lower annual home energy cost 17.59 $/year vs 22.89 $/year Around 25% lower annual home energy cost
Significantly lower annual commercial energy cost 63.95 $/year vs 83.22 $/year Around 25% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 875K vs i5 660

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 i7 875K
160,300 MB/s
Core i5 660
1,640,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

3D Mark 11 (Physics)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 875K  vs
i5 660 
Clock speed 2.93 GHz 3.33 GHz
Turbo clock speed 3.6 GHz 3.6 GHz
Cores Quad core Dual core
Socket type
LGA 1156
Is unlocked Yes No

features

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

power consumption

TDP 95W 73W
Annual home energy cost 22.89 $/year 17.59 $/year
Annual commercial energy cost 83.22 $/year 63.95 $/year
Performance per watt 2.32 pt/W 9.23 pt/W
Typical power consumption 77.19W 59.31W

bus

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

details

Core i7 875K  vs
i5 660 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 4 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Transistor count 774,000,000 382,000,000
Max CPUs 1 1
Clock multiplier 22 25
Voltage range 0.65 - 1.4V 0.65 - 1.4V
Operating temperature Unknown - 72.7°C Unknown - 72.6°C

overclocking

Overclocked clock speed 4.1 GHz 4.28 GHz
Overclocked clock speed (Water) 4.09 GHz 4.86 GHz
Overclocked clock speed (Air) 4.1 GHz 4.28 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 733 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 16,384 MB 16,773.12 MB
Intel Core i7 875K
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Intel Core i5 660
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