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Differences What are the advantages of each

Front view of AMD Athlon II X4 2.6 GHz

Reasons to consider the
AMD Athlon II X4 2.6 GHz

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Much more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Front view of AMD A6 7400K

Reasons to consider the
AMD A6 7400K

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Much higher clock speed 3.5 GHz vs 2.6 GHz Around 35% higher clock speed
Much newer manufacturing process 28 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor

Features Key features of the Athlon II X4 2.6 GHz  vs A6 7400K 

clock speed

A6 7400K
3.5 GHz

L2 cache

Specifications Full list of technical specs

summary

Athlon II X4 2.6 GHz  vs
A6 7400K 
Clock speed 2.6 GHz 3.5 GHz
Cores Quad core Dual core

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

Athlon II X4 2.6 GHz  vs
A6 7400K 
Threads 4 2
L2 cache 2 MB 1 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 28 nm
Max CPUs 1 1

power consumption

Typical power consumption N/A 52.81W
AMD Athlon II X4 2.6 GHz
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AMD A6 7400K
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