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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 0.5 MB 12x more l2 cache; more data can be stored in the l2 cache for quick access later
Much higher clock speed 3 GHz vs 1.6 GHz More than 85% higher clock speed
Much better PassMark score 2,160 vs 406 More than 5.2x better PassMark score
Much better PassMark (Single core) score 1,251 vs 459 Around 2.8x better PassMark (Single core) score
Much better geekbench 2 (32-bit) score 2,826 vs 617 More than 4.5x better geekbench 2 (32-bit) 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 overclocked clock speed (Air) 4.22 GHz vs 2.45 GHz More than 70% better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
More threads 2 vs 1 Twice as many threads
Much better performance per watt 1.83 pt/W vs 0.44 pt/W Around 4.2x better performance per watt
Much lower typical power consumption 52.81W vs 90.9W More than 40% lower typical power consumption
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 (Water) 4.23 GHz vs 1.6 GHz Around 2.8x better overclocked clock speed (Water)
Much lower annual home energy cost 15.66 $/year vs 38.47 $/year 2.5x lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 81.56 $/year More than 30% lower annual commercial energy cost
Front view of AMD Athlon 64 2650e

Reasons to consider the
AMD Athlon 64 2650e

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Newer Nov, 2008 vs Jan, 2008 Release date 10 months later

Benchmarks Real world tests of Core2 Duo E8400 vs Athlon 64 2650e

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
Athlon 64 2650e
41,400 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

Core2 Duo E8400  vs
Athlon 64 2650e 
Clock speed 3 GHz 1.6 GHz
Cores Dual core Single core
Socket type
LGA 775
AM2

features

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

details

Core2 Duo E8400  vs
Athlon 64 2650e 
Threads 2 1
L2 cache 6 MB 0.5 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 65 nm
Max CPUs 1 1

overclocking

Overclock popularity 125 0
Overclock review score 4.5 4
Overclocked clock speed 4.22 GHz 2.45 GHz
Overclocked clock speed (Water) 4.23 GHz 1.6 GHz
Overclocked clock speed (Air) 4.22 GHz 2.45 GHz

power consumption

TDP 65W 15W
Annual home energy cost 15.66 $/year 38.47 $/year
Annual commercial energy cost 56.94 $/year 81.56 $/year
Performance per watt 1.83 pt/W 0.44 pt/W
Typical power consumption 52.81W 90.9W
Intel Core2 Duo E8400
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AMD Athlon 64 2650e
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