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Differences What are the advantages of each

Front view of AMD Phenom X2 B59

Reasons to consider the
AMD Phenom X2 B59

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Significantly higher clock speed 3.4 GHz vs 3 GHz Around 15% higher clock speed
Much better overclocked clock speed (Air) 4.34 GHz vs 3.72 GHz More than 15% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 4.61 GHz vs 4.04 GHz Around 15% better overclocked clock speed (Water)
Front view of AMD Athlon II X2 250

Reasons to consider the
AMD Athlon II X2 250

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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
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
Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost

Benchmarks Real world tests of Phenom X2 B59 vs Athlon II X2 250

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom X2 B59  vs
Athlon II X2 250 
Clock speed 3.4 GHz 3 GHz
Turbo clock speed 0 GHz 3.6 GHz
Cores Dual core Dual core
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

bus

Clock speed 2,200 MHz 2,000 MHz

details

Phenom X2 B59  vs
Athlon II X2 250 
Threads 2 2
L2 cache 1 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

overclocking

Overclocked clock speed 4.34 GHz 3.72 GHz
Overclocked clock speed (Water) 4.61 GHz 4.04 GHz
PassMark (Overclocked) 2,634.1 2,374.3
Overclocked clock speed (Air) 4.34 GHz 3.72 GHz

power consumption

TDP 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Performance per watt 1.35 pt/W 1.79 pt/W
Typical power consumption 65W 52.81W
AMD Phenom X2 B59
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AMD Athlon II X2 250
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