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Differences What are the advantages of each

Front view of Intel Atom N2800

Reasons to consider the
Intel Atom N2800

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Much better geekbench 3 AES single core score 29,200 MB/s vs 88.3 MB/s Around 330.8x better geekbench 3 AES single core score
Much lower typical power consumption 5.28W vs 77.19W 14.6x lower typical power consumption
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher Maximum operating temperature 100 °C vs 55 °C More than 80% higher Maximum operating temperature
Significantly better performance per watt 5.28 pt/W vs 0.92 pt/W Around 5.8x better performance per watt
Much lower annual home energy cost 1.57 $/year vs 22.89 $/year 14.6x lower annual home energy cost
Much lower annual commercial energy cost 5.69 $/year vs 83.22 $/year 14.6x lower annual commercial energy cost
Newer Dec, 2011 vs Jun, 2010 Release date over 1 years later
Front view of AMD Opteron 4122

Reasons to consider the
AMD Opteron 4122

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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
Higher clock speed 2.2 GHz vs 1.86 GHz Around 20% higher clock speed
Has virtualization support Yes vs No Somewhat common; Boosts performance of virtual machines
Much better geekbench 3 Multi-Core score 5,184 vs 1,082 More than 4.8x better geekbench 3 Multi-Core score
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More cores 4 vs 2 Twice as many cores; run more applications at once
Better overclocked clock speed (Air) 2.2 GHz vs 1.87 GHz Around 20% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 2.2 GHz vs 1.87 GHz Around 20% better overclocked clock speed (Water)

Benchmarks Real world tests of Atom N2800 vs Opteron 4122

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Atom N2800
1,082
Opteron 4122
5,184

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Atom N2800
29,200 MB/s
Opteron 4122
88.3 MB/s

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Atom N2800  vs
Opteron 4122 
Clock speed 1.86 GHz 2.2 GHz
Cores Dual core Quad core

features

Has a NX bit Yes Yes
Has virtualization support No Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
AES

power consumption

TDP 6.5W 95W
Annual home energy cost 1.57 $/year 22.89 $/year
Annual commercial energy cost 5.69 $/year 83.22 $/year
Performance per watt 5.28 pt/W 0.92 pt/W
Typical power consumption 5.28W 77.19W

details

Atom N2800  vs
Opteron 4122 
Threads 4 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 2
Operating temperature Unknown - 100°C 0 - 55°C

overclocking

Overclocked clock speed 1.87 GHz 2.2 GHz
Overclocked clock speed (Water) 1.87 GHz 2.2 GHz
Overclocked clock speed (Air) 1.87 GHz 2.2 GHz

integrated graphics

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

bus

Architecture DMI HyperTransport 3.0
Intel Atom N2800
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AMD Opteron 4122
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