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Differences What are the advantages of each

Front view of AMD Athlon II X4 635

Reasons to consider the
AMD Athlon II X4 635

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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
Much better overclocked clock speed (Air) 3.58 GHz vs 2.8 GHz Around 30% better overclocked clock speed (Air)
Higher clock speed 2.9 GHz vs 2.8 GHz Around 5% higher clock speed
Much higher Maximum operating temperature 71 °C vs 65 °C Around 10% higher Maximum operating temperature
Better overclocked clock speed (Water) 2.9 GHz vs 2.8 GHz Around 5% better overclocked clock speed (Water)
Front view of AMD Athlon II X2 221

Reasons to consider the
AMD Athlon II X2 221

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Much lower typical power consumption 52.81W vs 137.63W 2.6x 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 lower annual home energy cost 15.66 $/year vs 48.4 $/year 3.1x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 137.53 $/year 2.4x lower annual commercial energy cost
Newer Jan, 2012 vs Jan, 2010 Release date over 1 years later

Features Key features of the Athlon II X4 635  vs X2 221 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Athlon II X4 635  vs
X2 221 
Clock speed 2.9 GHz 2.8 GHz
Cores Quad core Dual core
Socket type
AM3
FM1

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
AMD64
AMD-V
3DNow!
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 95W 65W
Annual home energy cost 48.4 $/year 15.66 $/year
Annual commercial energy cost 137.53 $/year 56.94 $/year
Typical power consumption 137.63W 52.81W

details

Athlon II X4 635  vs
X2 221 
Architecture x86-64 x86-64
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 32 nm
Max CPUs 1 1
Voltage range 0.85 - 1.25V 0.91 - 1.41V
Operating temperature Unknown - 71°C Unknown - 65°C

overclocking

Overclocked clock speed 3.58 GHz 2.8 GHz
Overclocked clock speed (Water) 2.9 GHz 2.8 GHz
Overclocked clock speed (Air) 3.58 GHz 2.8 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
AMD Athlon II X4 635
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AMD Athlon II X2 221
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