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Differences What are the advantages of each

Front view of Intel Core2 Quad Q6600

Reasons to consider the
Intel Core2 Quad Q6600

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More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Better overclocked clock speed (Water) 3.6 GHz vs 3.5 GHz Around 5% better overclocked clock speed (Water)
Front view of AMD Phenom II X2 521

Reasons to consider the
AMD Phenom II X2 521

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Much higher clock speed 3.5 GHz vs 2.4 GHz More than 45% higher clock speed
Much newer manufacturing process 45 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.37 GHz vs 3.52 GHz Around 25% better overclocked clock speed (Air)
Much lower typical power consumption 52.81W vs 85.31W Around 40% lower typical power consumption
Much lower annual commercial energy cost 56.94 $/year vs 91.98 $/year Around 40% lower annual commercial energy cost
Much lower annual home energy cost 15.66 $/year vs 25.29 $/year Around 40% lower annual home energy cost
Newer May, 2011 vs Jan, 2007 Release date over 4 years later

Benchmarks Real world tests of Core2 Quad Q6600 vs Phenom II X2 521

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

Core2 Quad Q6600
102,800 MB/s
Phenom II X2 521
127.5 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core2 Quad Q6600  vs
Phenom II X2 521 
Clock speed 2.4 GHz 3.5 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE3
SSE
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

bus

Clock speed 1,066 MHz 2,000 MHz

details

Core2 Quad Q6600  vs
Phenom II X2 521 
Threads 4 2
L2 cache 8 MB 2 MB
L2 cache per core 2 MB/core 1 MB/core
Manufacture process 65 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 3.52 GHz 4.37 GHz
Overclocked clock speed (Water) 3.6 GHz 3.5 GHz
Overclocked clock speed (Air) 3.52 GHz 4.37 GHz

power consumption

TDP 105W 65W
Annual home energy cost 25.29 $/year 15.66 $/year
Annual commercial energy cost 91.98 $/year 56.94 $/year
Performance per watt 1.19 pt/W 1.22 pt/W
Typical power consumption 85.31W 52.81W
Intel Core2 Quad Q6600
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AMD Phenom II X2 521
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