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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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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of Intel Core i5 2500

Reasons to consider the
Intel Core i5 2500

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing

Benchmarks Real world tests of Core i7 975 vs i5 2500

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 i5 2500
2,410,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

Core i7 975
11,512
Core i5 2500
11,542

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 975  vs
i5 2500 
Clock speed 3.33 GHz 3.3 GHz
Turbo clock speed 3.6 GHz 3.7 GHz
Cores Quad core Quad core
Socket type
LGA 1366
LGA 1155
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
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
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 9.04 pt/W
Typical power consumption 212W 77.19W

bus

Architecture QPI DMI
Number of links 1 1
Transfer rate 6,400 MT/s 5,000 MT/s

details

Core i7 975  vs
i5 2500 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Clock multiplier 25 33
Operating temperature 5 - 67.9°C Unknown - 72.6°C

overclocking

Overclock popularity 8 57
Overclocked clock speed 4.46 GHz 3.7 GHz
Overclocked clock speed (Water) 4.45 GHz 4.21 GHz
Overclocked clock speed (Air) 4.46 GHz 3.7 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 2000
Number of displays supported N/A 2
GPU clock speed N/A 850 MHz
Turbo clock speed N/A 1,100 MHz

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 32,768 MB
Intel Core i7 975
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Intel Core i5 2500
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