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Differences What are the advantages of each

Front view of Intel Core i7 4770K

Reasons to consider the
Intel Core i7 4770K

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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 3.5 GHz vs 2 GHz 75% higher clock speed
Much more l2 cache 1 MB vs 0.5 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
More cores 4 vs 1 3 more cores; run more applications at once
More threads 8 vs 1 7 more threads
Much better PassMark score 10,016 vs 459 More than 21.8x better PassMark score
Much better overclocked clock speed (Air) 4.48 GHz vs 2.32 GHz Around 95% better overclocked clock speed (Air)
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Water) 4.55 GHz vs 2 GHz More than 2.2x better overclocked clock speed (Water)
Newer Jun, 2013 vs Dec, 2004 Release date over 8 years later
Front view of AMD Athlon XP 2900+

Reasons to consider the
AMD Athlon XP 2900+

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Much more l2 cache per core 0.5 MB/core vs 0.25 MB/core 2x more l2 cache per core

Benchmarks Real world tests of Core i7 4770K vs Athlon XP 2900+

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Core i7 4770K  vs
Athlon XP 2900+ 
Clock speed 3.5 GHz 2 GHz
Cores Quad core Single core

features

Has a NX bit Yes No
Instruction set extensions
SSE2
F16C
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
FMA3
SSE4.2
3DNow!
Supplemental SSE3
AES
AVX 2.0

details

Core i7 4770K  vs
Athlon XP 2900+ 
Threads 8 1
L2 cache 1 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 22 nm 130 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.48 GHz 2.32 GHz
Overclocked clock speed (Water) 4.55 GHz 2 GHz
Overclocked clock speed (Air) 4.48 GHz 2.32 GHz

power consumption

Typical power consumption 68.25W N/A
Intel Core i7 4770K
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AMD Athlon XP 2900+
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