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Differences What are the advantages of each

Front view of Intel Core i7 3930K

Reasons to consider the
Intel Core i7 3930K

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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 higher clock speed 3.2 GHz vs 1.6 GHz 2x higher clock speed
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 better PassMark score 12,084 vs 428 Around 28.2x better PassMark score
Much better overclocked clock speed (Air) 4.67 GHz vs 1.6 GHz Around 3x better overclocked clock speed (Air)
More cores 6 vs 1 5 more cores; run more applications at once
More threads 12 vs 1 11 more threads
Newer Nov, 2011 vs Sep, 2003 Release date over 8 years later
Much better performance per watt 5.5 pt/W vs 0.21 pt/W More than 25.8x better performance per watt
Much better overclocked clock speed (Water) 4.67 GHz vs 1.6 GHz Around 3x better overclocked clock speed (Water)
Front view of AMD Opteron 142

Reasons to consider the
AMD Opteron 142

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Much lower typical power consumption 66.71W vs 172.6W 2.6x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.33 MB/core More than 3x more l2 cache per core
Much lower annual home energy cost 19.78 $/year vs 56.96 $/year 2.9x lower annual home energy cost
Much lower annual commercial energy cost 71.92 $/year vs 177.83 $/year 2.5x lower annual commercial energy cost

Benchmarks Real world tests of Core i7 3930K vs Opteron 142

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i7 3930K  vs
Opteron 142 
Clock speed 3.2 GHz 1.6 GHz
Cores Hexa core Single core
Socket type
LGA 2011
940

features

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

details

Core i7 3930K  vs
Opteron 142 
Threads 12 1
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 1 MB/core
Manufacture process 32 nm 130 nm
Max CPUs 1 1
Clock multiplier 32 8
Voltage range 0.6 - 1.35V 1.3 - UnknownV

overclocking

Overclocked clock speed 4.67 GHz 1.6 GHz
Overclocked clock speed (Water) 4.67 GHz 1.6 GHz
Overclocked clock speed (Air) 4.67 GHz 1.6 GHz

power consumption

TDP 130W 82.1W
Annual home energy cost 56.96 $/year 19.78 $/year
Annual commercial energy cost 177.83 $/year 71.92 $/year
Performance per watt 5.5 pt/W 0.21 pt/W
Typical power consumption 172.6W 66.71W
Intel Core i7 3930K
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AMD Opteron 142
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