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Differences What are the advantages of each

Front view of AMD Athlon II X4 645

Reasons to consider the
AMD Athlon II X4 645

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Much more l3 cache 0.5 MB vs 0 MB Compared to all cpus, 0.5 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
Higher clock speed 3.1 GHz vs 3 GHz Around 5% higher clock speed
Newer Sep, 2010 vs Jun, 2009 Release date over 1 years later
Front view of AMD Athlon II X2 250

Reasons to consider the
AMD Athlon II X2 250

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Much lower typical power consumption 52.81W vs 122.78W 2.3x lower typical power consumption
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.79 pt/W vs 1.08 pt/W More than 65% better performance per watt
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower annual home energy cost 15.66 $/year vs 44.01 $/year 2.8x lower annual home energy cost
Higher Maximum operating temperature 74 °C vs 71 °C Around 5% higher Maximum operating temperature
Much lower annual commercial energy cost 56.94 $/year vs 121.5 $/year 2.1x lower annual commercial energy cost
Much better overclocked clock speed (Water) 4.04 GHz vs 3.1 GHz More than 30% better overclocked clock speed (Water)
Better overclocked clock speed (Air) 3.72 GHz vs 3.67 GHz Almost the same

Benchmarks Real world tests of Athlon II X4 645 vs 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

Athlon II X4 645
124,500 MB/s
Athlon II X2 250
120,700 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Reviews Word on the street

Specifications Full list of technical specs

summary

Athlon II X4 645  vs
X2 250 
Clock speed 3.1 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 645  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 0.5 MB 0 MB
L3 cache per core 0.13 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 15 25
Overclocked clock speed 3.67 GHz 3.72 GHz
Overclocked clock speed (Water) 3.1 GHz 4.04 GHz
PassMark (Overclocked) 2,068.5 2,374.3
Overclocked clock speed (Air) 3.67 GHz 3.72 GHz

power consumption

TDP 95W 65W
Annual home energy cost 44.01 $/year 15.66 $/year
Annual commercial energy cost 121.5 $/year 56.94 $/year
Performance per watt 1.08 pt/W 1.79 pt/W
Typical power consumption 122.78W 52.81W

bus

Clock speed 2,000 MHz 2,000 MHz
AMD Athlon II X4 645
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AMD Athlon II X2 250
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