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Differences What are the advantages of each

Front view of Intel Core i7 3820

Reasons to consider the
Intel Core i7 3820

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher clock speed 3.6 GHz vs 2.8 GHz Around 30% higher clock speed
Much better overclocked clock speed (Air) 4.68 GHz vs 2.87 GHz Around 65% better overclocked clock speed (Air)
Much more l3 cache per core 2.5 MB/core vs 0.25 MB/core 10x more l3 cache per core
Much better overclocked clock speed (Water) 4.71 GHz vs 2.5 GHz Around 90% better overclocked clock speed (Water)
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 139.6W 2.6x lower typical power consumption
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 49.49 $/year 3.2x lower annual home energy cost
Significantly higher Maximum operating temperature 70.5 °C vs 66.8 °C More than 5% higher Maximum operating temperature
Much lower annual commercial energy cost 56.94 $/year vs 138.93 $/year 2.4x lower annual commercial energy cost

Benchmarks Real world tests of Core i7 3820 vs A8 3820

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Core i7 3820
12,538
A8 3820
4,151

GeekBench 3 (Single core) Data courtesy Primate Labs

Core i7 3820
3,098
A8 3820
1,426

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 3820
2,500,000 MB/s
A8 3820
116.05 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Core i7 3820
12,550
A8 3820
4,614

GeekBench

Core i7 3820
15,655
A8 3820
5,067

PassMark Data courtesy Passmark

Core i7 3820
8,998
A8 3820
3,152

PassMark (Single Core)

Core i7 3820
1,943
A8 3820
874

Specifications Full list of technical specs

summary

Core i7 3820  vs
A8 3820 
Clock speed 3.6 GHz 2.8 GHz
Turbo clock speed 3.8 GHz 2.8 GHz
Cores Quad core Quad core
Is unlocked Yes No

features

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

power consumption

TDP 130W 65W
Annual home energy cost 49.49 $/year 15.66 $/year
Annual commercial energy cost 138.93 $/year 56.94 $/year
Performance per watt 6.18 pt/W 1.91 pt/W
Typical power consumption 139.6W 52.81W

details

Core i7 3820  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 10 MB 1 MB
L3 cache per core 2.5 MB/core 0.25 MB/core
Manufacture process 32 nm 32 nm
Transistor count 1,270,000,000 1,178,000,000
Max CPUs 1 1
Voltage range 0.6 - 1.35V 0.45 - 1.41V
Operating temperature Unknown - 66.8°C Unknown - 70.5°C

overclocking

Overclocked clock speed 4.68 GHz 2.87 GHz
Overclocked clock speed (Water) 4.71 GHz 2.5 GHz
Overclocked clock speed (Air) 4.68 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
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
Intel Core i7 3820
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AMD A8 3820
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