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Differences What are the advantages of each

Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much higher clock speed 3 GHz vs 2.2 GHz More than 35% higher clock speed
Much better PassMark (Single core) score 1,251 vs 737 Around 70% better PassMark (Single core) score
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better performance per watt 1.83 pt/W vs 0.99 pt/W Around 85% better performance per watt
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Much better overclocked clock speed (Air) 4.22 GHz vs 3.7 GHz Around 15% better overclocked clock speed (Air)
Higher Maximum operating temperature 72.4 °C vs 71 °C Almost the same
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
Significantly better overclocked clock speed (Water) 4.23 GHz vs 3.7 GHz Around 15% better overclocked clock speed (Water)
Front view of AMD Phenom X3 8550

Reasons to consider the
AMD Phenom X3 8550

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More cores 3 vs 2 1 more cores; run more applications at once
More threads 3 vs 2 1 more threads
Newer Aug, 2008 vs Jan, 2008 Release date 7 months later

Benchmarks Real world tests of Core2 Duo E8400 vs Phenom X3 8550

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

Core2 Duo E8400
128,000 MB/s
Phenom X3 8550
85,100 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Phenom X3 8550 
Clock speed 3 GHz 2.2 GHz
Cores Dual core Tri core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
SSE4.1
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

bus

Clock speed 1,333 MHz 1,800 MHz

details

Core2 Duo E8400  vs
Phenom X3 8550 
Threads 2 3
L2 cache 6 MB 2 MB
L2 cache per core 3 MB/core 0.67 MB/core
Manufacture process 45 nm 65 nm
Max CPUs 1 1
Operating temperature Unknown - 72.4°C Unknown - 71°C

overclocking

Overclocked clock speed 4.22 GHz 3.7 GHz
Overclocked clock speed (Water) 4.23 GHz 3.7 GHz
Overclocked clock speed (Air) 4.22 GHz 3.7 GHz

power consumption

TDP 65W 95W
Annual home energy cost 15.66 $/year 22.89 $/year
Annual commercial energy cost 56.94 $/year 83.22 $/year
Performance per watt 1.83 pt/W 0.99 pt/W
Typical power consumption 52.81W 77.19W
Intel Core2 Duo E8400
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AMD Phenom X3 8550
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