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Differences What are the advantages of each

Front view of AMD Athlon X2 5600B

Reasons to consider the
AMD Athlon X2 5600B

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Much more l3 cache per core 0.25 MB/core vs 0.13 MB/core 2x more l3 cache per core
Much lower typical power consumption 52.81W vs 81.25W 35% lower typical power consumption
Much lower annual home energy cost 15.66 $/year vs 24.09 $/year 35% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 87.6 $/year 35% lower annual commercial energy cost
Front view of AMD A8 5600K

Reasons to consider the
AMD A8 5600K

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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
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much newer manufacturing process 32 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.6 GHz vs 2.9 GHz Around 25% higher clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better PassMark score 4,326 vs 1,304 More than 3.2x better PassMark score
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much better overclocked clock speed (Air) 4.29 GHz vs 2.9 GHz Around 50% better overclocked clock speed (Air)
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much better overclocked clock speed (Water) 4.71 GHz vs 2.9 GHz More than 60% better overclocked clock speed (Water)
Higher Maximum operating temperature 74 °C vs 72 °C Around 5% higher Maximum operating temperature
Newer Oct, 2012 vs Aug, 2008 Release date over 4 years later

Benchmarks Real world tests of Athlon X2 5600B vs A8 5600K

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Athlon X2 5600B  vs
A8 5600K 
Clock speed 2.9 GHz 3.6 GHz
Cores Dual core Quad core
Is unlocked No Yes

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
SSE3
SSE
CLMUL
AMD64
SSE4.1
FMA4
SSE4.2
CVT16
AMD-V
3DNow!
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 100W
Annual home energy cost 15.66 $/year 24.09 $/year
Annual commercial energy cost 56.94 $/year 87.6 $/year
Performance per watt 1.18 pt/W 4.86 pt/W
Typical power consumption 52.81W 81.25W

details

Athlon X2 5600B  vs
A8 5600K 
Threads 2 4
L2 cache 1 MB 4 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 0.5 MB 0.5 MB
L3 cache per core 0.25 MB/core 0.13 MB/core
Manufacture process 65 nm 32 nm
Max CPUs 1 1
Voltage range 1.1 - 1.35V 0.82 - 1.48V
Operating temperature Unknown - 72°C Unknown - 74°C

overclocking

Overclocked clock speed 2.9 GHz 4.29 GHz
Overclocked clock speed (Water) 2.9 GHz 4.71 GHz
Overclocked clock speed (Air) 2.9 GHz 4.29 GHz

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 7560D
Latest DirectX N/A 11.0
GPU clock speed N/A 760 MHz
AMD Athlon X2 5600B
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AMD A8 5600K
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