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AMD Athlon II X4 640

Front view of AMD Athlon II X4 640
Front view of AMD Athlon II X2 250

AMD Athlon II X2 250

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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
Newer May, 2010 vs Jun, 2009 Release date 11 months later
Front view of AMD Athlon II X2 250

Reasons to consider the
AMD Athlon II X2 250

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Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Higher Maximum operating temperature 74 °C vs 71 °C Around 5% higher Maximum operating temperature
Better overclocked clock speed (Air) 3.72 GHz vs 3.57 GHz Around 5% better overclocked clock speed (Air)
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Better overclocked clock speed (Water) 4.04 GHz vs 3.89 GHz Around 5% better overclocked clock speed (Water)

Benchmarks Real world tests of Athlon II X4 640 vs X2 250

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Athlon II X4 640
5,434
Athlon II X2 250
2,814

GeekBench 3 (Single core) Data courtesy Primate Labs

Athlon II X4 640
1,559
Athlon II X2 250
1,524

GeekBench 3 (AES single core) Data courtesy Primate Labs

Athlon II X4 640
121,100 MB/s
Athlon II X2 250
120,700 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

Athlon II X4 640
5,198
Athlon II X2 250
2,690

GeekBench (64-bit) Data courtesy Primate Labs

Athlon II X4 640
5,313
Athlon II X2 250
2,929

GeekBench

Athlon II X4 640
6,861
Athlon II X2 250
4,461

PassMark Data courtesy Passmark

Athlon II X4 640
3,327
Athlon II X2 250
1,750

PassMark (Single Core)

Athlon II X4 640
1,026
Athlon II X2 250
1,008

Reviews Word on the street

Athlon II X4 640  vs X2 250 
9.1
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9.6
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Specifications Full list of technical specs

summary

 Athlon II X4 640  vs
X2 250 
Clock speed 3 GHz 3 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
AVX 1.1
SSE2
F16C
MMX
XOP
AVX
SSE3
SSE
BMI1
AMD64
SSE4.1
FMA4
FMA3
SSE4.2
ABM
CVT16
AMD-V
3DNow!
Supplemental SSE3
AES
TBM
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

 Athlon II X4 640  vs
X2 250 
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 0 MB
L3 cache per core 0 MB/core 0 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Voltage range 1.05 - 1.4V 0.85 - 1.43V
Operating temperature Unknown - 71°C Unknown - 74°C

overclocking
Overclock popularity 36 25
Overclocked clock speed 3.57 GHz 3.72 GHz
Overclocked clock speed (Water) 3.89 GHz 4.04 GHz
PassMark (Overclocked) 2,020.8 2,374.3
Overclocked clock speed (Air) 3.57 GHz 3.72 GHz

power consumption
TDP 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 1.54 pt/W 1.79 pt/W
Typical power consumption 77.19W 52.81W

bus
Clock speed 2,000 MHz 2,000 MHz
AMD Athlon II X4 640
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AMD Athlon II X2 250
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