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Differences What are the advantages of each

Front view of Intel Core i7 6700K

Reasons to consider the
Intel Core i7 6700K

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Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 4 GHz vs 3.4 GHz Around 20% higher clock speed
Much better PassMark score 11,109 vs 2,104 More than 5.2x better PassMark score
Much better PassMark (Single core) score 2,349 vs 1,153 More than 2x better PassMark (Single core) score
Significantly better overclocked clock speed (Air) 4.61 GHz vs 3.4 GHz More than 35% better overclocked clock speed (Air)
More threads 8 vs 2 6 more threads
Newer Jul, 2015 vs Jan, 2011 Release date over 4 years later
More cores 4 vs 2 Twice as many cores; run more applications at once
Better performance per watt 3.49 pt/W vs 2 pt/W More than 75% better performance per watt
Much better overclocked clock speed (Water) 4.77 GHz vs 3.4 GHz More than 40% better overclocked clock speed (Water)
Front view of AMD Phenom II X2 511

Reasons to consider the
AMD Phenom II X2 511

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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 more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Significantly lower typical power consumption 52.81W vs 73.94W Around 30% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 21.92 $/year Around 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 79.72 $/year Around 30% lower annual commercial energy cost

Benchmarks Real world tests of Core i7 6700K vs Phenom II X2 511

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Core i7 6700K
6,010 MB/s
Phenom II X2 511
134,650 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i7 6700K  vs
Phenom II X2 511 
Clock speed 4 GHz 3.4 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

details

Core i7 6700K  vs
Phenom II X2 511 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 14 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.61 GHz 3.4 GHz
Overclocked clock speed (Water) 4.77 GHz 3.4 GHz
Overclocked clock speed (Air) 4.61 GHz 3.4 GHz

power consumption

TDP 91W 65W
Annual home energy cost 21.92 $/year 15.66 $/year
Annual commercial energy cost 79.72 $/year 56.94 $/year
Performance per watt 3.49 pt/W 2 pt/W
Typical power consumption 73.94W 52.81W
Intel Core i7 6700K
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AMD Phenom II X2 511
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