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Differences What are the advantages of each

Front view of Intel Core i7 3820QM

Reasons to consider the
Intel Core i7 3820QM

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Much newer manufacturing process 22 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.7 GHz vs 2 GHz More than 35% higher clock speed
Much better performance per watt 11.94 pt/W vs 0.47 pt/W Around 25.8x better performance per watt
Much lower typical power consumption 41W vs 77.19W More than 45% lower typical power consumption
Much better PassMark score 8,498 vs 1,083 More than 7.8x better PassMark score
Much higher Maximum operating temperature 105 °C vs 67 °C More than 55% higher Maximum operating temperature
Much better overclocked clock speed (Air) 3.83 GHz vs 2 GHz More than 90% better overclocked clock speed (Air)
Newer Apr, 2012 vs Jan, 2005 Release date over 7 years later
More threads 8 vs 2 6 more threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Much lower annual commercial energy cost 42.92 $/year vs 83.22 $/year Around 50% lower annual commercial energy cost
Much lower annual home energy cost 13.05 $/year vs 22.89 $/year Around 45% lower annual home energy cost
Better overclocked clock speed (Water) 2.7 GHz vs 2 GHz More than 35% better overclocked clock speed (Water)
Front view of AMD Opteron 270

Reasons to consider the
AMD Opteron 270

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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
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration

Benchmarks Real world tests of Core i7 3820QM vs Opteron 270

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i7 3820QM  vs
Opteron 270 
Clock speed 2.7 GHz 2 GHz
Cores Quad core Dual core
Socket type
rPGA 988B
940

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Core i7 3820QM  vs
Opteron 270 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 22 nm 90 nm
Max CPUs 1 2
Clock multiplier 27 10
Voltage range 0.8 - 1.25V 1 - UnknownV
Operating temperature Unknown - 105°C 0 - 67°C

overclocking

Overclocked clock speed 3.83 GHz 2 GHz
Overclocked clock speed (Water) 2.7 GHz 2 GHz
Overclocked clock speed (Air) 3.83 GHz 2 GHz

power consumption

TDP 45W 95W
Annual home energy cost 13.05 $/year 22.89 $/year
Annual commercial energy cost 42.92 $/year 83.22 $/year
Performance per watt 11.94 pt/W 0.47 pt/W
Typical power consumption 41W 77.19W
Intel Core i7 3820QM
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AMD Opteron 270
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