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Differences What are the advantages of each

Front view of AMD Phenom II X3 700e

Reasons to consider the
AMD Phenom II X3 700e

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More cores 3 vs 2 1 more cores; run more applications at once
More threads 3 vs 2 1 more threads
Higher Maximum operating temperature 72 °C vs 70 °C Around 5% higher Maximum operating temperature
Front view of AMD A6 7400K

Reasons to consider the
AMD A6 7400K

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Much more l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 3.5 GHz vs 2.4 GHz More than 45% higher clock speed
Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much better PassMark (Single core) score 1,573 vs 772 More than 2x better PassMark (Single core) score
Much newer manufacturing process 28 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 2.8 pt/W vs 1.14 pt/W Around 2.5x better performance per watt
Much more l2 cache per core 0.5 MB/core vs 0.17 MB/core More than 3x more l2 cache per core
Newer Jan, 2014 vs Jun, 2009 Release date over 4 years later

Benchmarks Real world tests of Phenom II X3 700e vs A6 7400K

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 X3 700e
97.1 MB/s
A6 7400K
1,910 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X3 700e  vs
A6 7400K 
Clock speed 2.4 GHz 3.5 GHz
Cores Tri core Dual core
Socket type
AM3
FM2+
Is unlocked No Yes

features

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

details

Phenom II X3 700e  vs
A6 7400K 
Architecture x86-64 x86-64
Threads 3 2
L2 cache 0.5 MB 1 MB
L2 cache per core 0.17 MB/core 0.5 MB/core
Manufacture process 45 nm 28 nm
Max CPUs 1 1
Operating temperature Unknown - 72°C Unknown - 70°C

integrated graphics

GPU None GPU
Label N/A Radeon R5 series

power consumption

TDP 65W 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Performance per watt 1.14 pt/W 2.8 pt/W
Typical power consumption 52.81W 52.81W
AMD Phenom II X3 700e
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AMD A6 7400K
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