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Differences What are the advantages of each

Front view of Intel Core2 Quad Q9705

Reasons to consider the
Intel Core2 Quad Q9705

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More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Higher clock speed 3.17 GHz vs 3 GHz More than 5% higher clock speed
Front view of Intel Core2 Duo E8400

Reasons to consider the
Intel Core2 Duo E8400

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Much better overclocked clock speed (Air) 4.22 GHz vs 3.17 GHz Around 35% better overclocked clock speed (Air)
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Much better overclocked clock speed (Water) 4.23 GHz vs 3.17 GHz Around 35% better overclocked clock speed (Water)
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost

Benchmarks Real world tests of Core2 Quad Q9705 vs Duo E8400

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core2 Quad Q9705  vs
Duo E8400 
Clock speed 3.17 GHz 3 GHz
Cores Quad core Dual core
Socket type
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

bus

Clock speed 1,333 MHz 1,333 MHz

details

Core2 Quad Q9705  vs
Duo E8400 
Threads 4 2
L2 cache 6 MB 6 MB
L2 cache per core 1.5 MB/core 3 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.17 GHz 4.22 GHz
Overclocked clock speed (Water) 3.17 GHz 4.23 GHz
Overclocked clock speed (Air) 3.17 GHz 4.22 GHz

power consumption

TDP 95W 65W
Annual home energy cost 22.89 $/year 15.66 $/year
Annual commercial energy cost 83.22 $/year 56.94 $/year
Performance per watt 1.7 pt/W 1.83 pt/W
Typical power consumption 77.19W 52.81W
Intel Core2 Quad Q9705
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Intel Core2 Duo E8400
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