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Differences What are the advantages of each

Front view of Intel Core2 Duo E4400

Reasons to consider the
Intel Core2 Duo E4400

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Much better geekbench 3 AES single core score 85,000 MB/s vs 29,200 MB/s Around 3x better geekbench 3 AES single core score
Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Significantly better overclocked clock speed (Air) 3.16 GHz vs 1.87 GHz Around 70% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.53 GHz vs 1.87 GHz Around 90% better overclocked clock speed (Water)
Front view of Intel Atom N2800

Reasons to consider the
Intel Atom N2800

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Much newer manufacturing process 32 nm vs 65 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
Much lower typical power consumption 5.28W vs 52.81W 10x lower typical power consumption
Much higher Maximum operating temperature 100 °C vs 61.4 °C Around 65% higher Maximum operating temperature
Significantly better performance per watt 5.28 pt/W vs 1.25 pt/W Around 4.2x better performance per watt
Newer Dec, 2011 vs Apr, 2007 Release date over 4 years later
Much lower annual home energy cost 1.57 $/year vs 15.66 $/year 10x lower annual home energy cost
Much lower annual commercial energy cost 5.69 $/year vs 56.94 $/year 10x lower annual commercial energy cost
More threads 4 vs 2 Twice as many threads

Benchmarks Real world tests of Core2 Duo E4400 vs Atom N2800

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 E4400
85,000 MB/s
Atom N2800
29,200 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 E4400  vs
Atom N2800 
Clock speed 2 GHz 1.86 GHz
Cores Dual core Dual core

features

Has a NX bit Yes Yes
Supports trusted computing No No
Has virtualization support No No
Instruction set extensions
SSE2
MMX
SSE3
SSE
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 65W 6.5W
Annual home energy cost 15.66 $/year 1.57 $/year
Annual commercial energy cost 56.94 $/year 5.69 $/year
Performance per watt 1.25 pt/W 5.28 pt/W
Typical power consumption 52.81W 5.28W

details

Core2 Duo E4400  vs
Atom N2800 
Architecture x86-64 x86-64
Threads 2 4
L2 cache 2 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 65 nm 32 nm
Max CPUs 1 1
Operating temperature Unknown - 61.4°C Unknown - 100°C

overclocking

Overclocked clock speed 3.16 GHz 1.87 GHz
Overclocked clock speed (Water) 3.53 GHz 1.87 GHz
Overclocked clock speed (Air) 3.16 GHz 1.87 GHz

integrated graphics

GPU None GPU
Label N/A Integrated
GPU clock speed N/A 640 MHz

bus

Architecture FSB DMI
Number of links 1 1
Intel Core2 Duo E4400
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Intel Atom N2800
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