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Differences What are the advantages of each

Front view of AMD Phenom II X2 550

Reasons to consider the
AMD Phenom II X2 550

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Much more l3 cache 6 MB vs None Compared to all cpus, 6 MB l3 cache is just OK
Front view of AMD A6 6400K

Reasons to consider the
AMD A6 6400K

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Much higher clock speed 3.9 GHz vs 3.1 GHz More than 25% higher clock speed
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 124.5W 2.4x 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 7.25 pt/W vs 0.89 pt/W More than 8x better performance per watt
Much better overclocked clock speed (Air) 4.76 GHz vs 3.81 GHz Around 25% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 46.25 $/year 3x lower annual home energy cost
Much better overclocked clock speed (Water) 5.16 GHz vs 3.12 GHz More than 65% better overclocked clock speed (Water)
Much lower annual commercial energy cost 56.94 $/year vs 120.89 $/year 2.1x lower annual commercial energy cost
Newer Jun, 2013 vs Nov, 2009 Release date over 3 years later

Benchmarks Real world tests of Phenom II X2 550 vs A6 6400K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Phenom II X2 550
125,000 MB/s
A6 6400K
2,380,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

3D Mark 11 (Physics)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X2 550  vs
A6 6400K 
Clock speed 3.1 GHz 3.9 GHz
Cores Dual core Dual core
Is unlocked Yes Yes

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
AVX 1.1
SSE2
F16C
MMX
XOP
AVX
SSE3
SSE
BMI1
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
ABM
CVT16
AMD-V
3DNow!
Supplemental SSE3
AES
TBM
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 80W 65W
Annual home energy cost 46.25 $/year 15.66 $/year
Annual commercial energy cost 120.89 $/year 56.94 $/year
Performance per watt 0.89 pt/W 7.25 pt/W
Typical power consumption 124.5W 52.81W

details

Phenom II X2 550  vs
A6 6400K 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 6 MB None
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Operating temperature Unknown - 70°C Unknown - 70°C

overclocking

Overclocked clock speed 3.81 GHz 4.76 GHz
Overclocked clock speed (Water) 3.12 GHz 5.16 GHz
Overclocked clock speed (Air) 3.81 GHz 4.76 GHz

integrated graphics

GPU None GPU
Label N/A Radeon™ HD 8470D
Latest DirectX N/A 11.0
GPU clock speed N/A 800 MHz
AMD Phenom II X2 550
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AMD A6 6400K
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