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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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More cores 4 vs 2 Twice as many cores; run more applications at once
Front view of Intel Core i5 650

Reasons to consider the
Intel Core i5 650

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 4.67 pt/W vs 1.11 pt/W Around 4.2x better performance per watt
Higher clock speed 3.2 GHz vs 2.93 GHz Around 10% higher clock speed
Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core
Significantly lower typical power consumption 100.22W vs 121W More than 15% lower typical power consumption
Significantly better overclocked clock speed (Air) 4.31 GHz vs 4.1 GHz More than 5% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 5.08 GHz vs 4.28 GHz Around 20% better overclocked clock speed (Water)
Significantly lower annual commercial energy cost 96.89 $/year vs 120.89 $/year Around 20% lower annual commercial energy cost
Significantly lower annual home energy cost 37.54 $/year vs 42.57 $/year More than 10% lower annual home energy cost

Benchmarks Real world tests of Core i7 870 vs i5 650

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 870
8,046
Core i5 650
4,709

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 870
2,243
Core i5 650
2,168

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 870
142,100 MB/s
Core i5 650
1,550,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 870
7,874
Core i5 650
4,675

GeekBench (64-bit) Data courtesy Primate Labs

Core i7 870
8,534
Core i5 650
4,902

GeekBench

Core i7 870
10,143
Core i5 650
6,669

PassMark Data courtesy Passmark

Core i7 870
5,398
Core i5 650
3,116

PassMark (Single Core)

Core i7 870
1,300
Core i5 650
1,319

Specifications Full list of technical specs

summary

Core i7 870  vs
i5 650 
Clock speed 2.93 GHz 3.2 GHz
Turbo clock speed 3.6 GHz 3.46 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 Yes
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 73W
Annual home energy cost 42.57 $/year 37.54 $/year
Annual commercial energy cost 120.89 $/year 96.89 $/year
Performance per watt 1.11 pt/W 4.67 pt/W
Idle power consumption 70W 69.1W
Peak power consumption 138W 110.6W
Typical power consumption 121W 100.22W

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 650 
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 24
Voltage range 0.65 - 1.4V 0.65 - 1.4V
Operating temperature Unknown - 72.7°C Unknown - 72.6°C

overclocking

Overclock popularity 37 21
Overclocked clock speed 4.1 GHz 4.31 GHz
Overclocked clock speed (Water) 4.28 GHz 5.08 GHz
Overclocked clock speed (Air) 4.1 GHz 4.31 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
Number of displays supported N/A 2
GPU clock speed N/A 733 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 650
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