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Differences What are the advantages of each

Front view of AMD Athlon X4 740

Reasons to consider the
AMD Athlon X4 740

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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
Significantly higher clock speed 3.2 GHz vs 2.8 GHz Around 15% higher clock speed
Much better overclocked clock speed (Air) 4.21 GHz vs 2.8 GHz More than 50% better overclocked clock speed (Air)
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much higher Maximum operating temperature 73 °C vs 65 °C More than 10% higher Maximum operating temperature
Better overclocked clock speed (Water) 3 GHz vs 2.8 GHz More than 5% better overclocked clock speed (Water)
Newer Oct, 2012 vs Jan, 2012 Release date 9 months later
Front view of AMD Athlon II X2 221

Reasons to consider the
AMD Athlon II X2 221

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CPUBoss is not aware of any important advantages of the Athlon II X2 221 vs the Athlon X4 740.

Features Key features of the Athlon X4 740  vs II X2 221 

clock speed

L2 cache

overclocked clock speed (air)

Athlon X4 740
4.21 GHz

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Athlon X4 740  vs
II X2 221 
Clock speed 3.2 GHz 2.8 GHz
Turbo clock speed 3.7 GHz None
Cores Quad core Dual core

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 65W
Annual home energy cost 15.66 $/year 15.66 $/year
Annual commercial energy cost 56.94 $/year 56.94 $/year
Typical power consumption 52.81W 52.81W

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3-1600

details

Athlon X4 740  vs
II X2 221 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 4 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 32 nm 32 nm
Transistor count 1,303,000,000 1,178,000,000
Max CPUs 1 1
Die size 246 mm² 228 mm²
Voltage range 0.82 - 1.48V 0.91 - 1.41V
Operating temperature Unknown - 73°C Unknown - 65°C

overclocking

Overclocked clock speed 4.21 GHz 2.8 GHz
Overclocked clock speed (Water) 3 GHz 2.8 GHz
Overclocked clock speed (Air) 4.21 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 X4 740
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AMD Athlon II X2 221
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