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Differences What are the advantages of each

Front view of Intel Core2 Quad Q9400

Reasons to consider the
Intel Core2 Quad Q9400

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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 higher clock speed 2.66 GHz vs 1.33 GHz 2x higher clock speed
Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Much more l2 cache per core 1.5 MB/core vs 0.5 MB/core 3x more l2 cache per core
Much better overclocked clock speed (Air) 3.54 GHz vs 1.33 GHz Around 2.8x better overclocked clock speed (Air)
Significantly better geekbench 3 Multi-Core score 5,123 vs 2,048 More than 2.5x better geekbench 3 Multi-Core score
Significantly better geekbench 3 single core score 1,490 vs 714 More than 2x better geekbench 3 single core score
Much better overclocked clock speed (Water) 4.15 GHz vs 1.33 GHz More than 3x better overclocked clock speed (Water)
Front view of Intel Atom Z3735E

Reasons to consider the
Intel Atom Z3735E

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Much better performance per dollar 6.29 pt/$ vs 0.72 pt/$ More than 8.8x better performance per dollar
Much newer manufacturing process 22 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Newer Jan, 2014 vs Jul, 2008 Release date over 5 years later

Benchmarks Real world tests of Core2 Quad Q9400 vs Atom Z3735E

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 Quad Q9400
114,000 MB/s
Atom Z3735E
279,300 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Quad Q9400  vs
Atom Z3735E 
Clock speed 2.66 GHz 1.33 GHz
Cores Quad core Quad core

features

Has virtualization support Yes Yes
Supports dynamic frequency scaling Yes No

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics
GPU clock speed N/A 311 MHz

bus

Architecture FSB FSB
Number of links 1 1

details

Core2 Quad Q9400  vs
Atom Z3735E 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 6 MB 2 MB
L2 cache per core 1.5 MB/core 0.5 MB/core
Manufacture process 45 nm 22 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.54 GHz 1.33 GHz
Overclocked clock speed (Water) 4.15 GHz 1.33 GHz
Overclocked clock speed (Air) 3.54 GHz 1.33 GHz

power consumption

Typical power consumption 77.19W N/A
Intel Core2 Quad Q9400
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Intel Atom Z3735E
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