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Differences What are the advantages of each

Front view of AMD Phenom II X4 945 95W

Reasons to consider the
AMD Phenom II X4 945 95W

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3 GHz vs 1.6 GHz More than 85% higher clock speed
Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much better overclocked clock speed (Air) 3.68 GHz vs 1.6 GHz More than 2.2x better overclocked clock speed (Air)
More cores 4 vs 1 3 more cores; run more applications at once
Newer Nov, 2009 vs May, 2004 Release date over 5 years later
More threads 4 vs 1 3 more threads
Much better overclocked clock speed (Water) 3.81 GHz vs 1.6 GHz Around 2.5x better overclocked clock speed (Water)
Front view of AMD Athlon 64 2700+

Reasons to consider the
AMD Athlon 64 2700+

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Much lower typical power consumption 28.44W vs 77.19W 2.7x lower typical power consumption
Significantly higher Maximum operating temperature 95 °C vs 70 °C More than 35% higher Maximum operating temperature
Much lower annual home energy cost 8.43 $/year vs 22.89 $/year 2.7x lower annual home energy cost
Much lower annual commercial energy cost 30.66 $/year vs 83.22 $/year 2.7x lower annual commercial energy cost

Features Key features of the Phenom II X4 945 95W  vs Athlon 64 2700+ 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Phenom II X4 945 95W  vs
Athlon 64 2700+ 
Clock speed 3 GHz 1.6 GHz
Cores Quad core Single core
Socket type
AM3
754

features

Has a NX bit Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!

details

Phenom II X4 945 95W  vs
Athlon 64 2700+ 
Threads 4 1
L2 cache 2 MB 0.5 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 1
Operating temperature 55 - 70°C Unknown - 95°C

overclocking

Overclocked clock speed 3.68 GHz 1.6 GHz
Overclocked clock speed (Water) 3.81 GHz 1.6 GHz
Overclocked clock speed (Air) 3.68 GHz 1.6 GHz

power consumption

TDP 95W 35W
Annual home energy cost 22.89 $/year 8.43 $/year
Annual commercial energy cost 83.22 $/year 30.66 $/year
Typical power consumption 77.19W 28.44W
AMD Phenom II X4 945 95W
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AMD Athlon 64 2700+
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