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Differences What are the advantages of each

Front view of Intel Core i7 2600K

Reasons to consider the
Intel Core i7 2600K

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Much newer manufacturing process 32 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.4 GHz vs 2.17 GHz More than 55% 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 overclocked clock speed (Air) 5.05 GHz vs 2.44 GHz More than 2x better overclocked clock speed (Air)
Much better PassMark score 8,494 vs 393 More than 21.5x better PassMark score
Much better PassMark (Single core) score 1,920 vs 612 Around 3.2x better PassMark (Single core) score
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Water) 4.76 GHz vs 2.17 GHz Around 2.2x better overclocked clock speed (Water)
Newer Jan, 2011 vs Sep, 2002 Release date over 8 years later
Front view of AMD Athlon XP 2700+

Reasons to consider the
AMD Athlon XP 2700+

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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 2600K vs Athlon XP 2700+

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 2600K  vs
Athlon XP 2700+ 
Clock speed 3.4 GHz 2.17 GHz
Cores Quad core Single core
Socket type
LGA 1155
462

features

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

details

Core i7 2600K  vs
Athlon XP 2700+ 
Threads 8 1
L2 cache 1 MB 0.5 MB
L2 cache per core 0.25 MB/core 0.5 MB/core
Manufacture process 32 nm 130 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 5.05 GHz 2.44 GHz
Overclocked clock speed (Water) 4.76 GHz 2.17 GHz
Overclocked clock speed (Air) 5.05 GHz 2.44 GHz

power consumption

Typical power consumption 114.2W N/A
Intel Core i7 2600K
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AMD Athlon XP 2700+
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