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Differences What are the advantages of each

Front view of AMD Opteron 846

Reasons to consider the
AMD Opteron 846

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Higher clock speed 2 GHz vs 1.7 GHz Around 20% higher clock speed
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Better overclocked clock speed (Air) 2 GHz vs 1.72 GHz More than 15% better overclocked clock speed (Air)
Better overclocked clock speed (Water) 2 GHz vs 1.7 GHz Around 20% better overclocked clock speed (Water)
Front view of AMD E2 1800

Reasons to consider the
AMD E2 1800

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Much newer manufacturing process 32 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 14.63W vs 72.31W 4.9x lower typical power consumption
Newer Jun, 2012 vs Sep, 2003 Release date over 8 years later
Much higher Maximum operating temperature 100 °C vs 71 °C More than 40% higher Maximum operating temperature
Much lower annual home energy cost 4.34 $/year vs 21.44 $/year 4.9x lower annual home energy cost
Much lower annual commercial energy cost 15.77 $/year vs 77.96 $/year 4.9x lower annual commercial energy cost
More cores 2 vs 1 Twice as many cores; run more applications at once

Features Key features of the Opteron 846  vs E2 1800 

clock speed

Opteron 846
2 GHz
E2 1800
1.7 GHz

L2 cache

E2 1800
1 MB

overclocked clock speed (air)

Opteron 846
2 GHz
E2 1800
1.72 GHz

overclocked clock speed (water)

Opteron 846
2 GHz
E2 1800
1.7 GHz

TDP

Specifications Full list of technical specs

summary

Opteron 846  vs
E2 1800 
Clock speed 2 GHz 1.7 GHz
Cores Single core Dual core

features

Has a NX bit Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
AMD64
AMD-V
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

details

Opteron 846  vs
E2 1800 
Threads 1 2
L2 cache 1 MB 1 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 130 nm 32 nm
Max CPUs 8 1
Clock multiplier 10 5
Voltage range 1.5 - UnknownV 0.88 - 1.35V
Operating temperature 0 - 71°C Unknown - 100°C

overclocking

Overclocked clock speed 2 GHz 1.72 GHz
Overclocked clock speed (Water) 2 GHz 1.7 GHz
Overclocked clock speed (Air) 2 GHz 1.72 GHz

power consumption

TDP 89W 18W
Annual home energy cost 21.44 $/year 4.34 $/year
Annual commercial energy cost 77.96 $/year 15.77 $/year
Typical power consumption 72.31W 14.63W
AMD Opteron 846
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AMD E2 1800
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