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Differences What are the advantages of each

Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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Higher clock speed 3.3 GHz vs 2.8 GHz Around 20% higher clock speed
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Significantly better overclocked clock speed (Air) 4.98 GHz vs 3.83 GHz Around 30% better overclocked clock speed (Air)
More cores 4 vs 2 Twice as many cores; run more applications at once
Much better overclocked clock speed (Water) 4.88 GHz vs 2.8 GHz Around 75% better overclocked clock speed (Water)
More threads 4 vs 2 Twice as many threads
Newer Jan, 2011 vs Apr, 2010 Release date 8 months later
Front view of AMD Athlon II XLT V66C

Reasons to consider the
AMD Athlon II XLT V66C

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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 typical power consumption 36.56W vs 112.55W 3.1x lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Much lower annual home energy cost 10.84 $/year vs 41.29 $/year 3.8x lower annual home energy cost
Much lower annual commercial energy cost 39.42 $/year vs 110.03 $/year 2.8x lower annual commercial energy cost

Features Key features of the Core i5 2500K  vs Athlon II XLT V66C 

clock speed

L2 cache

overclocked clock speed (air)

Core i5 2500K
4.98 GHz

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Core i5 2500K  vs
Athlon II XLT V66C 
Clock speed 3.3 GHz 2.8 GHz
Cores Quad core Dual core
Socket type
LGA 1155
AM3

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

details

Core i5 2500K  vs
Athlon II XLT V66C 
Threads 4 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.98 GHz 3.83 GHz
Overclocked clock speed (Water) 4.88 GHz 2.8 GHz
Overclocked clock speed (Air) 4.98 GHz 3.83 GHz

power consumption

TDP 95W 45W
Annual home energy cost 41.29 $/year 10.84 $/year
Annual commercial energy cost 110.03 $/year 39.42 $/year
Typical power consumption 112.55W 36.56W
Intel Core i5 2500K
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AMD Athlon II XLT V66C
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