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Differences What are the advantages of each

Front view of Intel Core i7 4790K

Reasons to consider the
Intel Core i7 4790K

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Much newer manufacturing process 22 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 4 GHz vs 1.8 GHz Around 2.2x higher clock speed
Much better overclocked clock speed (Air) 4.63 GHz vs 2.17 GHz Around 2.2x better overclocked clock speed (Air)
Newer Apr, 2014 vs Aug, 2003 Release date over 10 years later
More threads 8 vs 1 7 more threads
More cores 4 vs 1 3 more cores; run more applications at once
Much better overclocked clock speed (Water) 4.8 GHz vs 1.8 GHz Around 2.8x better overclocked clock speed (Water)
Front view of AMD Opteron 244

Reasons to consider the
AMD Opteron 244

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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

Features Key features of the Core i7 4790K  vs Opteron 244 

clock speed

Opteron 244
1.8 GHz

L2 cache

overclocked clock speed (air)

Core i7 4790K
4.63 GHz
Opteron 244
2.17 GHz

overclocked clock speed (water)

Core i7 4790K
4.8 GHz
Opteron 244
1.8 GHz

TDP

Specifications Full list of technical specs

summary

Core i7 4790K  vs
Opteron 244 
Clock speed 4 GHz 1.8 GHz
Cores Quad core Single core

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
F16C
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
FMA3
SSE4.2
3DNow!
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

details

Core i7 4790K  vs
Opteron 244 
Threads 8 1
L2 cache 1 MB 1 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 22 nm 130 nm
Max CPUs 1 2
Operating temperature Unknown - 74.04°C 0 - 71°C

overclocking

Overclocked clock speed 4.63 GHz 2.17 GHz
Overclocked clock speed (Water) 4.8 GHz 1.8 GHz
PassMark (Overclocked) 6,925.3 839.6
Overclocked clock speed (Air) 4.63 GHz 2.17 GHz

power consumption

TDP 88W 84.7W
Annual home energy cost 21.2 $/year 20.4 $/year
Annual commercial energy cost 77.09 $/year 74.2 $/year
Typical power consumption 71.5W 68.82W
Intel Core i7 4790K
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AMD Opteron 244
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