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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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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of AMD Athlon II X4 640

Reasons to consider the
AMD Athlon II X4 640

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CPUBoss is not aware of any important advantages of the Athlon II X4 640 vs the Phenom II X2 550.

Benchmarks Real world tests of Phenom II X2 550 vs Athlon II X4 640

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
Athlon II X4 640
121,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X2 550  vs
Athlon II X4 640 
Clock speed 3.1 GHz 3 GHz
Cores Dual core Quad core
Socket type
AM3
Is unlocked Yes No

features

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

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

details

Phenom II X2 550  vs
Athlon II X4 640 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 6 MB 0 MB
L3 cache per core 3 MB/core 0 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.85 - 1.43V 1.05 - 1.4V
Operating temperature Unknown - 70°C Unknown - 71°C

overclocking

Overclock popularity 7 36
Overclocked clock speed 3.81 GHz 3.57 GHz
Overclocked clock speed (Water) 3.12 GHz 3.89 GHz
PassMark (Overclocked) 1,881.5 2,020.8
Overclocked clock speed (Air) 3.81 GHz 3.57 GHz

power consumption

TDP 80W 95W
Annual home energy cost 46.25 $/year 22.89 $/year
Annual commercial energy cost 120.89 $/year 83.22 $/year
Performance per watt 0.89 pt/W 1.54 pt/W
Typical power consumption 124.5W 77.19W

bus

Clock speed 2,000 MHz 2,000 MHz
AMD Phenom II X2 550
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AMD Athlon II X4 640
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