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Differences What are the advantages of each

Front view of Intel Atom E640

Reasons to consider the
Intel Atom E640

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 2.92W vs 44.69W 15.3x lower typical power consumption
Much lower annual home energy cost 0.87 $/year vs 13.25 $/year 15.3x lower annual home energy cost
Much lower annual commercial energy cost 3.15 $/year vs 48.18 $/year 15.3x lower annual commercial energy cost
Newer Sep, 2010 vs Jan, 2009 Release date over 1 years later
Front view of AMD Opteron 2374 HE

Reasons to consider the
AMD Opteron 2374 HE

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Much better geekbench 3 AES single core score 94,100 MB/s vs 15.6 MB/s More than 6032x better geekbench 3 AES single core score
Significantly higher clock speed 2.2 GHz vs 1 GHz Around 2.2x higher clock speed
Much more l2 cache 2 MB vs 0.5 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much better geekbench 3 Multi-Core score 4,259 vs 308 More than 13.8x 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 1 3 more cores; run more applications at once
Significantly better overclocked clock speed (Air) 2.2 GHz vs 1 GHz Around 2.2x better overclocked clock speed (Air)
More threads 4 vs 2 Twice as many threads
Significantly better overclocked clock speed (Water) 2.2 GHz vs 1 GHz Around 2.2x better overclocked clock speed (Water)

Benchmarks Real world tests of Atom E640 vs Opteron 2374 HE

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

Atom E640
15.6 MB/s
Opteron 2374 HE
94,100 MB/s

Specifications Full list of technical specs

summary

Atom E640  vs
Opteron 2374 HE 
Clock speed 1 GHz 2.2 GHz
Cores Single core Quad core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 3.6W 55W
Annual home energy cost 0.87 $/year 13.25 $/year
Annual commercial energy cost 3.15 $/year 48.18 $/year
Performance per watt 2.4 pt/W 2.25 pt/W
Typical power consumption 2.92W 44.69W

details

Atom E640  vs
Opteron 2374 HE 
Threads 2 4
L2 cache 0.5 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 2
Clock multiplier 10 11
Voltage range 0.75 - 0.9V 1 - UnknownV

overclocking

Overclocked clock speed 1 GHz 2.2 GHz
Overclocked clock speed (Water) 1 GHz 2.2 GHz
Overclocked clock speed (Air) 1 GHz 2.2 GHz

integrated graphics

GPU GPU None
Label Integrated N/A
GPU clock speed 320 MHz N/A

bus

Clock speed 2,500 MHz 2,000 MHz
Intel Atom E640
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AMD Opteron 2374 HE
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