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Differences What are the advantages of each

Front view of Intel Core2 Duo E8600

Reasons to consider the
Intel Core2 Duo E8600

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Much higher clock speed 3.33 GHz vs 2.9 GHz Around 15% higher clock speed
Much better overclocked clock speed (Water) 4.63 GHz vs 2.9 GHz Around 60% better overclocked clock speed (Water)
Front view of AMD Phenom II X4 840T

Reasons to consider the
AMD Phenom II X4 840T

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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

Benchmarks Real world tests of Core2 Duo E8600 vs Phenom II X4 840T

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 Duo E8600
136,900 MB/s
Phenom II X4 840T
120,800 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 Duo E8600  vs
Phenom II X4 840T 
Clock speed 3.33 GHz 2.9 GHz
Cores Dual core Quad core

features

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

bus

Clock speed 1,333 MHz 2,000 MHz

details

Core2 Duo E8600  vs
Phenom II X4 840T 
Threads 2 4
L2 cache 6 MB 2 MB
L2 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.61 GHz 3.78 GHz
Overclocked clock speed (Water) 4.63 GHz 2.9 GHz
Overclocked clock speed (Air) 4.61 GHz 3.78 GHz

power consumption

TDP 65W 95W
Annual home energy cost 47.3 $/year 22.89 $/year
Annual commercial energy cost 113.62 $/year 83.22 $/year
Performance per watt 1.11 pt/W 1.55 pt/W
Typical power consumption 120.65W 77.19W
Intel Core2 Duo E8600
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AMD Phenom II X4 840T
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