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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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Much better overclocked clock speed (Air) 4.1 GHz vs 2.87 GHz Around 45% better overclocked clock speed (Air)
Much more l3 cache per core 2 MB/core vs 0.25 MB/core 8x more l3 cache per core
Higher clock speed 2.93 GHz vs 2.8 GHz Around 5% higher clock speed
Much better overclocked clock speed (Water) 4.28 GHz vs 2.5 GHz More than 70% better overclocked clock speed (Water)
Higher Maximum operating temperature 72.7 °C vs 70.5 °C Around 5% higher Maximum operating temperature
Front view of AMD A8 3820

Reasons to consider the
AMD A8 3820

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Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 52.81W vs 121W 2.3x lower typical power consumption
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 1.91 pt/W vs 1.11 pt/W More than 70% better performance per watt
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower annual home energy cost 15.66 $/year vs 42.57 $/year 2.7x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 120.89 $/year 2.1x lower annual commercial energy cost
Newer Dec, 2011 vs Jul, 2009 Release date over 2 years later

Benchmarks Real world tests of Core i7 870 vs A8 3820

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 870
8,046
A8 3820
4,151

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 870
2,243
A8 3820
1,426

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 870
142,100 MB/s
A8 3820
116.05 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 870
7,874
A8 3820
4,614

GeekBench

Core i7 870
10,143
A8 3820
5,067

PassMark Data courtesy Passmark

Core i7 870
5,398
A8 3820
3,152

PassMark (Single Core)

Core i7 870
1,300
A8 3820
874

Specifications Full list of technical specs

summary

Core i7 870  vs
A8 3820 
Clock speed 2.93 GHz 2.8 GHz
Turbo clock speed 3.6 GHz 2.8 GHz
Cores Quad core Quad core
Is unlocked No No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
AMD64
SSE4.1
SSE4.2
AMD-V
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 65W
Annual home energy cost 42.57 $/year 15.66 $/year
Annual commercial energy cost 120.89 $/year 56.94 $/year
Performance per watt 1.11 pt/W 1.91 pt/W
Typical power consumption 121W 52.81W

details

Core i7 870  vs
A8 3820 
Architecture x86-64 x86-64
Threads 8 4
L2 cache 1 MB 4 MB
L2 cache per core 0.25 MB/core 1 MB/core
L3 cache 8 MB 1 MB
L3 cache per core 2 MB/core 0.25 MB/core
Manufacture process 45 nm 32 nm
Transistor count 774,000,000 1,178,000,000
Max CPUs 1 1
Voltage range 0.65 - 1.4V 0.45 - 1.41V
Operating temperature Unknown - 72.7°C Unknown - 70.5°C

overclocking

Overclocked clock speed 4.1 GHz 2.87 GHz
Overclocked clock speed (Water) 4.28 GHz 2.5 GHz
Overclocked clock speed (Air) 4.1 GHz 2.87 GHz

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 6550D
Latest DirectX N/A 11.0
GPU clock speed N/A 600 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1333
DDR3-1066
DDR3
Intel Core i7 870
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AMD A8 3820
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