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Differences What are the advantages of each

Front view of Intel Core i7 990X

Reasons to consider the
Intel Core i7 990X

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Much higher clock speed 3.46 GHz vs 1.8 GHz More than 90% higher clock speed
Much better overclocked clock speed (Air) 4.58 GHz vs 2.26 GHz More than 2x better overclocked clock speed (Air)
Significantly more l3 cache per core 2 MB/core vs 1 MB/core 2x more l3 cache per core
Much better overclocked clock speed (Water) 4.47 GHz vs 1.8 GHz Around 2.5x better overclocked clock speed (Water)
Front view of AMD Opteron 6266 HE

Reasons to consider the
AMD Opteron 6266 HE

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Much more l2 cache 16 MB vs 2 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Supports more CPUs in SMP configuration 4 vs 1 3 supports more CPUs in SMP configuration
More cores 16 vs 6 10 more cores; run more applications at once
Much lower typical power consumption 69.06W vs 105.63W Around 35% lower typical power consumption
More l3 cache 16 MB vs 12 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Much more l2 cache per core 1 MB/core vs 0.33 MB/core More than 3x more l2 cache per core
More threads 16 vs 12 4 more threads
Much lower annual home energy cost 20.48 $/year vs 31.32 $/year Around 35% lower annual home energy cost
Much lower annual commercial energy cost 74.46 $/year vs 113.88 $/year Around 35% lower annual commercial energy cost

Features Key features of the Core i7 990X  vs Opteron 6266 HE 

clock speed

Core i7 990X
3.46 GHz
Opteron 6266 HE
1.8 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Core i7 990X
4.58 GHz
Opteron 6266 HE
2.26 GHz

overclocked clock speed (water)

Core i7 990X
4.47 GHz
Opteron 6266 HE
1.8 GHz

Specifications Full list of technical specs

summary

Core i7 990X  vs
Opteron 6266 HE 
Clock speed 3.46 GHz 1.8 GHz
Cores Hexa core 16 core
Socket type
LGA 1366
G34

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES

bus

Architecture QPI HyperTransport 3.0
Transfer rate 6,400 MT/s 6,400 MT/s
Clock speed 3,200 MHz 3,200 MHz

details

Core i7 990X  vs
Opteron 6266 HE 
Threads 12 16
L2 cache 2 MB 16 MB
L2 cache per core 0.33 MB/core 1 MB/core
L3 cache 12 MB 16 MB
L3 cache per core 2 MB/core 1 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 1 4

overclocking

Overclocked clock speed 4.58 GHz 2.26 GHz
Overclocked clock speed (Water) 4.47 GHz 1.8 GHz
PassMark (Overclocked) 4,092.9 1,254.6
Overclocked clock speed (Air) 4.58 GHz 2.26 GHz

power consumption

TDP 130W 85W
Annual home energy cost 31.32 $/year 20.48 $/year
Annual commercial energy cost 113.88 $/year 74.46 $/year
Typical power consumption 105.63W 69.06W
Intel Core i7 990X
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AMD Opteron 6266 HE
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