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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 better overclocked clock speed (Water) 4.23 GHz vs 3.5 GHz More than 20% better overclocked clock speed (Water)
Front view of AMD Phenom II X2 521

Reasons to consider the
AMD Phenom II X2 521

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Significantly higher clock speed 3.5 GHz vs 3 GHz More than 15% higher clock speed
Better overclocked clock speed (Air) 4.37 GHz vs 4.22 GHz Around 5% better overclocked clock speed (Air)
Newer May, 2011 vs Jan, 2008 Release date over 3 years later

Benchmarks Real world tests of Core2 Duo E8400 vs Phenom II X2 521

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 521
127.5 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 II X2 521 
Clock speed 3 GHz 3.5 GHz
Cores Dual core Dual 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 2,000 MHz

details

Core2 Duo E8400  vs
Phenom II X2 521 
Threads 2 2
L2 cache 6 MB 2 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.22 GHz 4.37 GHz
Overclocked clock speed (Water) 4.23 GHz 3.5 GHz
Overclocked clock speed (Air) 4.22 GHz 4.37 GHz

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 1.83 pt/W 1.22 pt/W
Typical power consumption 52.81W 52.81W
Intel Core2 Duo E8400
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AMD Phenom II X2 521
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