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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 2 MB 3x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly higher clock speed 3 GHz vs 1.8 GHz More than 65% higher clock speed
Much better geekbench 2 (32-bit) score 2,826 vs 1,882 More than 50% better geekbench 2 (32-bit) score
Much more l2 cache per core 3 MB/core vs 1 MB/core 3x more l2 cache per core
Much better overclocked clock speed (Air) 4.22 GHz vs 2 GHz More than 2x better overclocked clock speed (Air)
Significantly better PassMark (Single core) score 1,251 vs 554 More than 2.2x better PassMark (Single core) score
Much better overclocked clock speed (Water) 4.23 GHz vs 1.8 GHz More than 2.2x better overclocked clock speed (Water)
Newer Jan, 2008 vs Aug, 2005 Release date over 2 years later
Higher Maximum operating temperature 72.4 °C vs 65 °C More than 10% higher Maximum operating temperature
Better PassMark score 2,160 vs 899 Around 2.5x better PassMark score
Better performance per watt 1.83 pt/W vs 1 pt/W More than 80% better performance per watt
Front view of AMD Opteron 165 HE

Reasons to consider the
AMD Opteron 165 HE

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Lower typical power consumption 44.69W vs 52.81W More than 15% lower typical power consumption
Lower annual home energy cost 13.25 $/year vs 15.66 $/year More than 15% lower annual home energy cost
Lower annual commercial energy cost 48.18 $/year vs 56.94 $/year More than 15% lower annual commercial energy cost

Benchmarks Real world tests of Core2 Duo E8400 vs Opteron 165 HE

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
Opteron 165 HE
49,700 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
Opteron 165 HE 
Clock speed 3 GHz 1.8 GHz
Cores Dual core Dual core
Socket type
LGA 775
939
940

features

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

details

Core2 Duo E8400  vs
Opteron 165 HE 
Threads 2 2
L2 cache 6 MB 2 MB
L2 cache per core 3 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 1
Operating temperature Unknown - 72.4°C 0 - 65°C

overclocking

Overclocked clock speed 4.22 GHz 2 GHz
Overclocked clock speed (Water) 4.23 GHz 1.8 GHz
Overclocked clock speed (Air) 4.22 GHz 2 GHz

power consumption

TDP 65W 55W
Annual home energy cost 15.66 $/year 13.25 $/year
Annual commercial energy cost 56.94 $/year 48.18 $/year
Performance per watt 1.83 pt/W 1 pt/W
Typical power consumption 52.81W 44.69W
Intel Core2 Duo E8400
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AMD Opteron 165 HE
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