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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
Front view of Intel Core i7 870S

Reasons to consider the
Intel Core i7 870S

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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing

Benchmarks Real world tests of Core i7 875K vs 870S

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 875K  vs
870S 
Clock speed 2.93 GHz 2.66 GHz
Turbo clock speed 3.6 GHz 3.6 GHz
Cores Quad core Quad 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
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 82W
Annual home energy cost 22.89 $/year 19.75 $/year
Annual commercial energy cost 83.22 $/year 71.83 $/year
Performance per watt 2.32 pt/W 2.16 pt/W
Typical power consumption 77.19W 66.63W

bus

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

details

Core i7 875K  vs
870S 
Architecture x86-64 x86-64
Threads 8 8
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 45 nm
Transistor count 774,000,000 774,000,000
Max CPUs 1 1
Clock multiplier 22 20
Voltage range 0.65 - 1.4V 0.65 - 1.4V

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3
Channels Dual Channel Dual Channel
Supports ECC No No
Maximum bandwidth 21,333.32 MB/s 21,333.32 MB/s
Maximum memory size 16,384 MB 16,384 MB
Intel Core i7 875K
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Intel Core i7 870S
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