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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 performance per watt 1.83 pt/W vs 1.11 pt/W More than 65% better performance per watt
Much lower typical power consumption 52.81W vs 102.72W Around 50% lower typical power consumption
Much better overclocked clock speed (Air) 4.22 GHz vs 3.86 GHz Around 10% better overclocked clock speed (Air)
Much lower annual home energy cost 15.66 $/year vs 36.79 $/year 2.3x lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 101.7 $/year Around 45% lower annual commercial energy cost
Much better overclocked clock speed (Water) 4.23 GHz vs 3.3 GHz Around 30% better overclocked clock speed (Water)
Front view of AMD Athlon II X2 265

Reasons to consider the
AMD Athlon II X2 265

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Higher clock speed 3.3 GHz vs 3 GHz Around 10% higher clock speed
Higher Maximum operating temperature 74 °C vs 72.4 °C Almost the same
Newer Sep, 2010 vs Jan, 2008 Release date over 2 years later

Benchmarks Real world tests of Core2 Duo E8400 vs Athlon II X2 265

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 II X2 265
133,500 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Cinebench R10 32-Bit

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Duo E8400  vs
Athlon II X2 265 
Clock speed 3 GHz 3.3 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 65W
Annual home energy cost 15.66 $/year 36.79 $/year
Annual commercial energy cost 56.94 $/year 101.7 $/year
Performance per watt 1.83 pt/W 1.11 pt/W
Typical power consumption 52.81W 102.72W

details

Core2 Duo E8400  vs
Athlon II X2 265 
Architecture x86-64 x86-64
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
Voltage range 0.85 - 1.36V 0.82 - 1.4V
Operating temperature Unknown - 72.4°C Unknown - 74°C

overclocking

Overclocked clock speed 4.22 GHz 3.86 GHz
Overclocked clock speed (Water) 4.23 GHz 3.3 GHz
Overclocked clock speed (Air) 4.22 GHz 3.86 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

bus

Clock speed 1,333 MHz 2,000 MHz
Intel Core2 Duo E8400
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AMD Athlon II X2 265
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