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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 more l2 cache 6 MB vs 1 MB 6x more l2 cache; more data can be stored in the l2 cache for quick access later
Much lower typical power consumption 52.81W vs 124.5W 2.4x lower typical power consumption
Much better performance per watt 1.83 pt/W vs 0.89 pt/W More than 2x better performance per watt
Much more l2 cache per core 3 MB/core vs 0.5 MB/core 6x more l2 cache per core
Much better overclocked clock speed (Air) 4.22 GHz vs 3.81 GHz More than 10% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 46.25 $/year 3x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 120.89 $/year 2.1x lower annual commercial energy cost
Higher Maximum operating temperature 72.4 °C vs 70 °C Around 5% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.23 GHz vs 3.12 GHz More than 35% better overclocked clock speed (Water)
Front view of AMD Phenom II X2 550

Reasons to consider the
AMD Phenom II X2 550

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Higher clock speed 3.1 GHz vs 3 GHz Around 5% higher clock speed
Newer Nov, 2009 vs Jan, 2008 Release date over 1 years later

Benchmarks Real world tests of Core2 Duo E8400 vs Phenom II X2 550

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 II X2 550
125,000 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench (64-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 II X2 550 
Clock speed 3 GHz 3.1 GHz
Cores Dual core Dual core
Socket type
LGA 775
AM3

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

power consumption

TDP 65W 80W
Annual home energy cost 15.66 $/year 46.25 $/year
Annual commercial energy cost 56.94 $/year 120.89 $/year
Performance per watt 1.83 pt/W 0.89 pt/W
Typical power consumption 52.81W 124.5W

bus

Clock speed 1,333 MHz 2,000 MHz

details

Core2 Duo E8400  vs
Phenom II X2 550 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 6 MB 1 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.85 - 1.36V 0.85 - 1.43V
Operating temperature Unknown - 72.4°C Unknown - 70°C

overclocking

Overclock popularity 125 7
Overclocked clock speed 4.22 GHz 3.81 GHz
Overclocked clock speed (Water) 4.23 GHz 3.12 GHz
Overclocked clock speed (Air) 4.22 GHz 3.81 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
Intel Core2 Duo E8400
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AMD Phenom II X2 550
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