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Differences What are the advantages of each

Front view of AMD Phenom X2 B59

Reasons to consider the
AMD Phenom X2 B59

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Much higher clock speed 3.4 GHz vs 2.5 GHz More than 35% higher clock speed
Much better overclocked clock speed (Air) 4.34 GHz vs 3.41 GHz More than 25% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.61 GHz vs 2.5 GHz Around 85% better overclocked clock speed (Water)
Front view of AMD Phenom II X4 905e

Reasons to consider the
AMD Phenom II X4 905e

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Much more l3 cache 6 MB vs 0 MB Compared to all cpus, 6 MB l3 cache is just OK
Much 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
More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Much more l3 cache per core 1.5 MB/core vs 0 MB/core Compared to all cpus, 1.5 MB/core l3 cache per core is just OK
Lower typical power consumption 52.81W vs 65W Around 20% lower typical power consumption
Lower annual commercial energy cost 56.94 $/year vs 70.08 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 15.66 $/year vs 19.27 $/year Around 20% lower annual home energy cost

Benchmarks Real world tests of Phenom X2 B59 vs II X4 905e

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom X2 B59  vs
II X4 905e 
Clock speed 3.4 GHz 2.5 GHz
Cores Dual core Quad core
Is unlocked No No

features

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

bus

Clock speed 2,200 MHz 2,000 MHz

details

Phenom X2 B59  vs
II X4 905e 
Threads 2 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 0 MB 6 MB
L3 cache per core 0 MB/core 1.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.34 GHz 3.41 GHz
Overclocked clock speed (Water) 4.61 GHz 2.5 GHz
Overclocked clock speed (Air) 4.34 GHz 3.41 GHz

power consumption

TDP 80W 65W
Annual home energy cost 19.27 $/year 15.66 $/year
Annual commercial energy cost 70.08 $/year 56.94 $/year
Performance per watt 1.35 pt/W 1.17 pt/W
Typical power consumption 65W 52.81W
AMD Phenom X2 B59
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AMD Phenom II X4 905e
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