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Differences What are the advantages of each

Front view of Intel Core i7 975

Reasons to consider the
Intel Core i7 975

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Higher clock speed 3.33 GHz vs 2.8 GHz Around 20% higher clock speed
Significantly better overclocked clock speed (Air) 4.46 GHz vs 3.29 GHz More than 35% better overclocked clock speed (Air)
Slightly more l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 8 vs 4 Twice as many threads
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much better overclocked clock speed (Water) 4.45 GHz vs 2.8 GHz Around 60% better overclocked clock speed (Water)
Newer Jun, 2009 vs Jan, 2009 Release date 4 months later
Front view of AMD Opteron 8386 SE

Reasons to consider the
AMD Opteron 8386 SE

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Much lower typical power consumption 85.31W vs 212W 2.5x lower typical power consumption
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 annual home energy cost 25.29 $/year vs 82.69 $/year 3.3x lower annual home energy cost
Much lower annual commercial energy cost 91.98 $/year vs 211.12 $/year 2.3x 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 975  vs Opteron 8386 SE 

clock speed

Core i7 975
3.33 GHz
Opteron 8386 SE
2.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 975
4.46 GHz
Opteron 8386 SE
3.29 GHz

overclocked clock speed (water)

Core i7 975
4.45 GHz
Opteron 8386 SE
2.8 GHz

Specifications Full list of technical specs

summary

Core i7 975  vs
Opteron 8386 SE 
Clock speed 3.33 GHz 2.8 GHz
Cores Quad core Quad core
Socket type
LGA 1366
F
Is unlocked Yes No

features

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

power consumption

TDP 130W 105W
Annual home energy cost 82.69 $/year 25.29 $/year
Annual commercial energy cost 211.12 $/year 91.98 $/year
Typical power consumption 212W 85.31W

bus

Clock speed 3,200 MHz 2,200 MHz

details

Core i7 975  vs
Opteron 8386 SE 
Threads 8 4
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 8
Clock multiplier 25 14
Voltage range 0.8 - 1.38V 1.32 - UnknownV

overclocking

Overclocked clock speed 4.46 GHz 3.29 GHz
Overclocked clock speed (Water) 4.45 GHz 2.8 GHz
Overclocked clock speed (Air) 4.46 GHz 3.29 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 975
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AMD Opteron 8386 SE
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