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Differences What are the advantages of each

Front view of AMD Athlon II X4 640

Reasons to consider the
AMD Athlon II X4 640

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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 performance per watt 1.54 pt/W vs 0.8 pt/W Around 95% better performance per watt
Much lower typical power consumption 77.19W vs 116.42W Around 35% lower typical power consumption
Much lower annual home energy cost 22.89 $/year vs 42.79 $/year More than 45% lower annual home energy cost
Much lower annual commercial energy cost 83.22 $/year vs 113.7 $/year More than 25% lower annual commercial energy cost
Front view of AMD Athlon II X2 255

Reasons to consider the
AMD Athlon II X2 255

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Much more l3 cache 1 MB vs 0 MB Compared to all cpus, 1 MB l3 cache is just OK
Much more l3 cache per core 0.5 MB/core vs 0 MB/core Compared to all cpus, 0.5 MB/core l3 cache per core is just OK
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Higher clock speed 3.1 GHz vs 3 GHz Around 5% higher clock speed
Significantly better overclocked clock speed (Air) 3.8 GHz vs 3.57 GHz More than 5% better overclocked clock speed (Air)
Higher Maximum operating temperature 74 °C vs 71 °C Around 5% higher Maximum operating temperature

Benchmarks Real world tests of Athlon II X4 640 vs X2 255

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

Athlon II X4 640
121,100 MB/s
Athlon II X2 255
125,000 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

Athlon II X4 640  vs
X2 255 
Clock speed 3 GHz 3.1 GHz
Cores Quad core Dual core
Socket type
AM3
Is unlocked No 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

power consumption

TDP 95W 65W
Annual home energy cost 22.89 $/year 42.79 $/year
Annual commercial energy cost 83.22 $/year 113.7 $/year
Performance per watt 1.54 pt/W 0.8 pt/W
Typical power consumption 77.19W 116.42W

bus

Clock speed 2,000 MHz 2,000 MHz

details

Athlon II X4 640  vs
X2 255 
Architecture x86-64 x86-64
Threads 4 2
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 0 MB 1 MB
L3 cache per core 0 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 1.05 - 1.4V 0.85 - 1.4V
Operating temperature Unknown - 71°C Unknown - 74°C

overclocking

Overclocked clock speed 3.57 GHz 3.8 GHz
Overclocked clock speed (Water) 3.89 GHz 3.93 GHz
PassMark (Overclocked) 2,020.8 1,567.5
Overclocked clock speed (Air) 3.57 GHz 3.8 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 640
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AMD Athlon II X2 255
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