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Differences What are the advantages of each

Front view of Intel Core i7 870

Reasons to consider the
Intel Core i7 870

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Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Front view of Intel Core i5 661

Reasons to consider the
Intel Core i5 661

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required

Benchmarks Real world tests of Core i7 870 vs i5 661

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 870
8,046
Core i5 661
4,966

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 870
2,243
Core i5 661
2,244

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 870
142,100 MB/s
Core i5 661
1,600,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 870
7,874
Core i5 661
4,874

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 870
8,534
Core i5 661
6,481

GeekBench

Core i7 870
10,143
Core i5 661
6,481

PassMark Data courtesy Passmark

Core i7 870
5,398
Core i5 661
3,184

PassMark (Single Core)

Core i7 870
1,300
Core i5 661
1,324

Reviews Word on the street

Specifications Full list of technical specs

summary

Core i7 870  vs
i5 661 
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 No No

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
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 87W
Annual home energy cost 42.57 $/year 36.95 $/year
Annual commercial energy cost 120.89 $/year 96.71 $/year
Performance per watt 1.11 pt/W 5.96 pt/W
Idle power consumption 70W 67W
Peak power consumption 138W 110.4W
Typical power consumption 121W 99.55W

bus

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

details

Core i7 870  vs
i5 661 
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 - 69.8°C

overclocking

Overclocked clock speed 4.1 GHz 4.66 GHz
Overclocked clock speed (Water) 4.28 GHz 3.33 GHz
Overclocked clock speed (Air) 4.1 GHz 4.66 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 900 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 870
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Intel Core i5 661
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