CPUBoss Review Our evaluation of 975 vs 875K among desktop CPUs (over 75W)

Performance

Benchmark performance using all cores

PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance

PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics

Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing

CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?

Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

4.1

CPUBoss Score

Combination of all six facets

Winner
Intel Core i7 975 

CPUBoss recommends the Intel Core i7 975  based on its .

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VS

Differences What are the advantages of each

Front view of Intel Core i7 975

Reasons to consider the
Intel Core i7 975

Report a correction

CPUBoss is not aware of any important advantages of the 975 Extreme Edition vs the 875K.

Front view of Intel Core i7 875K

Reasons to consider the
Intel Core i7 875K

Report a correction

CPUBoss is not aware of any important advantages of the 875K vs the 975 Extreme Edition.

Benchmarks Real world tests of Core i7 975 vs 875K

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 975
152,250 MB/s
Core i7 875K
160,300 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

Core i7 975
11,512
Core i7 875K
9,329

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 975  vs
875K 
Clock speed 3.33 GHz 2.93 GHz
Turbo clock speed 3.6 GHz 3.6 GHz
Cores Quad core Quad core
Socket type
LGA 1366
LGA 1156
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
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 130W 95W
Annual home energy cost 82.69 $/year 22.89 $/year
Annual commercial energy cost 211.12 $/year 83.22 $/year
Performance per watt 0.93 pt/W 2.32 pt/W
Typical power consumption 212W 77.19W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1333
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Dual Channel
Supports ECC No No
Maximum bandwidth 25,599.99 MB/s 21,333.32 MB/s
Maximum memory size 24,000 MB 16,384 MB

details

Core i7 975  vs
875K 
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 731,000,000 774,000,000
Max CPUs 1 1
Clock multiplier 25 22
Voltage range 0.8 - 1.38V 0.65 - 1.4V
Operating temperature 5 - 67.9°C Unknown - 72.7°C

overclocking

Overclock popularity 8 13
Overclocked clock speed 4.46 GHz 4.1 GHz
Overclocked clock speed (Water) 4.45 GHz 4.09 GHz
Overclocked clock speed (Air) 4.46 GHz 4.1 GHz

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

bus

Architecture QPI DMI
Number of links 1 1
Transfer rate 6,400 MT/s 2,500 MT/s
Intel Core i7 975
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Intel Core i7 875K
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