CPUBoss Review Our evaluation of 975 vs 920 among desktop CPUs (over 75W)

Performance

Benchmark performance using all cores
Core i7 975
6.3
Core i7 920
5.7
Core i5 2500K
6.6
PCMark 8 Home 3.0 Accelerated, PassMark and 1 more

Single-core Performance

Individual core benchmark performance
Core i7 975
6.1
Core i7 920
5.6
Core i5 2500K
7.8
PassMark (Single Core), Geekbench 3 Single Core and 1 more

Integrated Graphics

Integrated GPU performance for graphics
Core i7 975
0.0
Core i7 920
0.0
Core i5 2500K
n.d.
Fire Strike

Integrated Graphics (OpenCL)

Integrated GPU performance for parallel computing
Core i7 975
0.0
Core i7 920
0.0
Core i5 2500K
n.d.
CompuBench 1.5 Bitcoin mining and 4 more

Performance per Watt

How efficiently does the processor use electricity?
Core i7 975
5.4
Core i7 920
5.3
Core i5 2500K
8.5
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more

Value

Are you paying a premium for performance?
Core i7 975
n.d.
Core i7 920
n.d.
Core i5 2500K
6.6
Fire Strike, CompuBench 1.5 Bitcoin mining and 11 more
5.3

CPUBoss Score

Combination of all six facets
Core i7 975
5.3
Core i7 920
5.1
Core i5 2500K
8.2

Winner
Intel Core i7 975 

CPUBoss recommends the Intel Core i7 975  based on its performance and single-core performance.

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VS

Intel Core i7 975

Front view of Intel Core i7 975
Front view of Intel Core i7 920

Intel Core i7 920

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Differences What are the advantages of each

Front view of Intel Core i7 975

Reasons to consider the
Intel Core i7 975

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Much higher turbo clock speed 3.6 GHz vs 2.93 GHz Around 25% higher turbo clock speed
Significantly higher clock speed 3.33 GHz vs 2.66 GHz More than 25% higher clock speed
Much better geekbench 3 single core score 2,324 vs 1,959 Around 20% better geekbench 3 single core score
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much better cinebench r10 32Bit 1-core score 4,651 vs 3,846 More than 20% better cinebench r10 32Bit 1-core score
Much better PassMark score 6,276 vs 4,994 More than 25% better PassMark score
Much better cinebench r10 32Bit score 20,407 vs 16,211 More than 25% better cinebench r10 32Bit score
Better overclocked clock speed (Air) 4.47 GHz vs 4.23 GHz More than 5% better overclocked clock speed (Air)
Newer Jun, 2009 vs Oct, 2008 Release date 8 months later
Significantly better overclocked clock speed (Water) 4.39 GHz vs 4.01 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Core i7 920

Reasons to consider the
Intel Core i7 920

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Much lower typical power consumption 135.63W vs 212W More than 35% lower typical power consumption
Much lower annual home energy cost 48.38 $/year vs 82.69 $/year More than 40% lower annual home energy cost
Much lower annual commercial energy cost 134.55 $/year vs 211.12 $/year More than 35% lower annual commercial energy cost
Better performance per dollar 0.71 pt/$ vs 0.47 pt/$ More than 50% better performance per dollar

Benchmarks Real world tests of Core i7 975 vs 920

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 975
9,214
Core i7 920
7,014

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 975
2,324
Core i7 920
1,959

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 975
152,250 MB/s
Core i7 920
143,700 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 975
9,229
Core i7 920
7,125

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 975
9,894
Core i7 920
7,791

GeekBench

Core i7 975
11,512
Core i7 920
9,242

PassMark Data courtesy Passmark

Core i7 975
6,276
Core i7 920
4,994

PassMark (Single Core)

Core i7 975
1,459
Core i7 920
1,158

Specifications Full list of technical specs

summary

 Core i7 975  vs
920 
Clock speed 3.33 GHz 2.66 GHz
Turbo clock speed 3.6 GHz 2.93 GHz
Cores Quad core Quad core
Socket type
LGA 1366
Is unlocked Yes No

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 130W
Annual home energy cost 82.69 $/year 48.38 $/year
Annual commercial energy cost 211.12 $/year 134.55 $/year
Performance per watt 1.09 pt/W 1.41 pt/W
Idle power consumption 154W 81.7W
Peak power consumption 241W 153.6W
Typical power consumption 212W 135.63W

bus
Architecture QPI QPI
Number of links 1 1
Data rate 25,600 MB/s 19,200 MB/s
Transfer rate 6,400 MT/s 4,800 MT/s
Clock speed 3,200 MHz 2,400 MHz

details

 Core i7 975  vs
920 
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 731,000,000 731,000,000
Max CPUs 1 1
Clock multiplier 25 20
Voltage range 0.8 - 1.38V 0.8 - 1.38V
Operating temperature 5 - 67.9°C Unknown - 67.9°C

overclocking
Overclock popularity 8 491
Overclocked clock speed 4.47 GHz 4.23 GHz
Overclocked clock speed (Water) 4.39 GHz 4.01 GHz
Overclocked clock speed (Air) 4.47 GHz 4.23 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

memory controller
Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Triple Channel
Supports ECC No No
Maximum bandwidth 25,599.99 MB/s 25,599.99 MB/s
Intel Core i7 975
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Intel Core i7 920
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