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Differences What are the advantages of each

Front view of AMD Athlon 64 FX 51

Reasons to consider the
AMD Athlon 64 FX 51

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Higher clock speed 2.2 GHz vs 1.6 GHz Around 40% higher clock speed
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
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Better overclocked clock speed (Water) 2.2 GHz vs 1.6 GHz Around 40% better overclocked clock speed (Water)
Front view of AMD Athlon 64 2600+

Reasons to consider the
AMD Athlon 64 2600+

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Much newer manufacturing process 65 nm vs 130 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 12.19W vs 72.31W 5.9x lower typical power consumption
Higher Maximum operating temperature 85 °C vs 70 °C More than 20% higher Maximum operating temperature
Better performance per watt 2.19 pt/W vs 0.2 pt/W Around 11x better performance per watt
Much lower annual home energy cost 3.61 $/year vs 21.44 $/year 5.9x lower annual home energy cost
Much lower annual commercial energy cost 13.14 $/year vs 77.96 $/year 5.9x lower annual commercial energy cost

Benchmarks Real world tests of Athlon 64 FX 51 vs 2600+

PassMark Data courtesy Passmark

Specifications Full list of technical specs

summary

Athlon 64 FX 51  vs
2600+ 
Clock speed 2.2 GHz 1.6 GHz
Cores Single core Single core
Socket type
940
AM2

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
3DNow!

details

Athlon 64 FX 51  vs
2600+ 
Threads 1 1
L2 cache 1 MB 0.5 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 130 nm 65 nm
Max CPUs 1 1
Operating temperature Unknown - 70°C Unknown - 85°C

overclocking

Overclock popularity 1 0
Overclock review score 0 0
Overclocked clock speed 2.43 GHz 2.4 GHz
Overclocked clock speed (Water) 2.2 GHz 1.6 GHz
Overclocked clock speed (Air) 2.43 GHz 2.4 GHz

power consumption

TDP 89W 15W
Annual home energy cost 21.44 $/year 3.61 $/year
Annual commercial energy cost 77.96 $/year 13.14 $/year
Performance per watt 0.2 pt/W 2.19 pt/W
Typical power consumption 72.31W 12.19W
AMD Athlon 64 FX 51
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AMD Athlon 64 2600+
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