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Differences What are the advantages of each

Front view of AMD Phenom II X4 905e

Reasons to consider the
AMD Phenom II X4 905e

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Much more l3 cache 6 MB vs 0 MB Compared to all cpus, 6 MB l3 cache is just OK
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 l3 cache per core 1.5 MB/core vs 0 MB/core Compared to all cpus, 1.5 MB/core l3 cache per core is just OK
Front view of AMD Athlon II X2 250

Reasons to consider the
AMD Athlon II X2 250

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Significantly higher clock speed 3 GHz vs 2.5 GHz 20% higher clock speed
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 better overclocked clock speed (Air) 3.72 GHz vs 3.41 GHz Around 10% better overclocked clock speed (Air)
Significantly higher Maximum operating temperature 74 °C vs 70 °C More than 5% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.04 GHz vs 2.5 GHz More than 60% better overclocked clock speed (Water)

Benchmarks Real world tests of Phenom II X4 905e vs Athlon II X2 250

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 X4 905e
66.3 MB/s
Athlon II X2 250
120,700 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Cinebench R11.5

PassMark Data courtesy Passmark

PassMark (Single Core)

Reviews Word on the street

Specifications Full list of technical specs

summary

Phenom II X4 905e  vs
Athlon II X2 250 
Clock speed 2.5 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

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
Performance per watt 1.17 pt/W 1.79 pt/W
Typical power consumption 52.81W 52.81W

bus

Clock speed 2,000 MHz 2,000 MHz

details

Phenom II X4 905e  vs
Athlon II 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 6 MB 0 MB
L3 cache per core 1.5 MB/core 0 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 1 1
Voltage range 0.82 - 1.25V 0.85 - 1.43V
Operating temperature Unknown - 70°C Unknown - 74°C

overclocking

Overclocked clock speed 3.41 GHz 3.72 GHz
Overclocked clock speed (Water) 2.5 GHz 4.04 GHz
Overclocked clock speed (Air) 3.41 GHz 3.72 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 Phenom II X4 905e
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AMD Athlon II X2 250
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