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Differences What are the advantages of each

Front view of Intel Celeron G540

Reasons to consider the
Intel Celeron G540

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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
Significantly higher clock speed 2.5 GHz vs 1.4 GHz Around 80% higher clock speed
Newer Jul, 2011 vs Jun, 2003 Release date over 8 years later
Lower typical power consumption 52.81W vs 66.71W More than 20% lower typical power consumption
Significantly better overclocked clock speed (Air) 2.6 GHz vs 1.69 GHz Around 55% better overclocked clock speed (Air)
More cores 2 vs 1 Twice as many cores; run more applications at once
Significantly better overclocked clock speed (Water) 2.5 GHz vs 1.4 GHz Around 80% better overclocked clock speed (Water)
Lower annual home energy cost 15.66 $/year vs 19.78 $/year More than 20% lower annual home energy cost
Lower annual commercial energy cost 56.94 $/year vs 71.92 $/year More than 20% lower annual commercial energy cost
Front view of AMD Opteron 840

Reasons to consider the
AMD Opteron 840

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core

Features Key features of the Celeron G540  vs Opteron 840 

clock speed

Celeron G540
2.5 GHz
Opteron 840
1.4 GHz

L2 cache

overclocked clock speed (air)

Celeron G540
2.6 GHz
Opteron 840
1.69 GHz

overclocked clock speed (water)

Celeron G540
2.5 GHz
Opteron 840
1.4 GHz

TDP

Specifications Full list of technical specs

summary

Celeron G540  vs
Opteron 840 
Clock speed 2.5 GHz 1.4 GHz
Cores Dual core Single core
Socket type
LGA 1155
940

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3

details

Celeron G540  vs
Opteron 840 
Threads 2 1
L2 cache 1 MB 1 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 32 nm 130 nm
Max CPUs 1 8
Clock multiplier 25 7

overclocking

Overclocked clock speed 2.6 GHz 1.69 GHz
Overclocked clock speed (Water) 2.5 GHz 1.4 GHz
Overclocked clock speed (Air) 2.6 GHz 1.69 GHz

power consumption

TDP 65W 82.1W
Annual home energy cost 15.66 $/year 19.78 $/year
Annual commercial energy cost 56.94 $/year 71.92 $/year
Typical power consumption 52.81W 66.71W
Intel Celeron G540
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AMD Opteron 840
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