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Differences What are the advantages of each

Front view of Intel Core i7 3820

Reasons to consider the
Intel Core i7 3820

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Much higher clock speed 3.6 GHz vs 1.9 GHz Around 90% higher clock speed
Much newer manufacturing process 32 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More l3 cache 10 MB vs 2 MB 5x more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Air) 4.68 GHz vs 1.9 GHz Around 2.5x better overclocked clock speed (Air)
Much more l3 cache per core 2.5 MB/core vs 0.5 MB/core 5x more l3 cache per core
Newer Feb, 2012 vs Sep, 2007 Release date over 4 years later
More threads 8 vs 4 Twice as many threads
Higher Maximum operating temperature 66.8 °C vs 55 °C More than 20% higher Maximum operating temperature
Much better overclocked clock speed (Water) 4.71 GHz vs 1.9 GHz Around 2.5x better overclocked clock speed (Water)
Front view of AMD Opteron 8347 HE

Reasons to consider the
AMD Opteron 8347 HE

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
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 lower typical power consumption 44.69W vs 139.6W 3.1x lower typical power consumption
Much lower annual home energy cost 13.25 $/year vs 49.49 $/year 3.7x lower annual home energy cost
Much lower annual commercial energy cost 48.18 $/year vs 138.93 $/year 2.9x lower annual commercial energy cost
More l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Features Key features of the Core i7 3820  vs Opteron 8347 HE 

clock speed

Core i7 3820
3.6 GHz
Opteron 8347 HE
1.9 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 3820
4.68 GHz
Opteron 8347 HE
1.9 GHz

overclocked clock speed (water)

Core i7 3820
4.71 GHz
Opteron 8347 HE
1.9 GHz

Specifications Full list of technical specs

summary

Core i7 3820  vs
Opteron 8347 HE 
Clock speed 3.6 GHz 1.9 GHz
Cores Quad core Quad core
Socket type
LGA 2011
F
Is unlocked Yes No

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 130W 55W
Annual home energy cost 49.49 $/year 13.25 $/year
Annual commercial energy cost 138.93 $/year 48.18 $/year
Typical power consumption 139.6W 44.69W

details

Core i7 3820  vs
Opteron 8347 HE 
Threads 8 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 10 MB 2 MB
L3 cache per core 2.5 MB/core 0.5 MB/core
Manufacture process 32 nm 65 nm
Max CPUs 1 8
Clock multiplier 36 9
Voltage range 0.6 - 1.35V 1.12 - UnknownV
Operating temperature Unknown - 66.8°C 0 - 55°C

overclocking

Overclocked clock speed 4.68 GHz 1.9 GHz
Overclocked clock speed (Water) 4.71 GHz 1.9 GHz
Overclocked clock speed (Air) 4.68 GHz 1.9 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
Intel Core i7 3820
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AMD Opteron 8347 HE
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