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Differences What are the advantages of each

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 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
Much lower typical power consumption 52.81W vs 77.19W More than 30% lower typical power consumption
Significantly lower annual home energy cost 15.66 $/year vs 22.89 $/year More than 30% lower annual home energy cost
Significantly lower annual commercial energy cost 56.94 $/year vs 83.22 $/year More than 30% lower annual commercial energy cost
Front view of AMD Phenom II X4 840

Reasons to consider the
AMD Phenom II X4 840

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Much higher clock speed 3.2 GHz vs 2.5 GHz Around 30% higher clock speed
Much better overclocked clock speed (Air) 3.94 GHz vs 3.41 GHz More than 15% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 3.2 GHz vs 2.5 GHz Around 30% better overclocked clock speed (Water)
Higher Maximum operating temperature 71 °C vs 70 °C Almost the same
Newer Jan, 2011 vs Jun, 2009 Release date over 1 years later

Benchmarks Real world tests of Phenom II X4 905e vs 840

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

Phenom II X4 905e
66.3 MB/s
Phenom II X4 840
129,500 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Cinebench R11.5

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X4 905e  vs
840 
Clock speed 2.5 GHz 3.2 GHz
Cores Quad core Quad core
Socket type
AM3
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

power consumption

TDP 65W 95W
Annual home energy cost 15.66 $/year 22.89 $/year
Annual commercial energy cost 56.94 $/year 83.22 $/year
Performance per watt 1.17 pt/W 1.87 pt/W
Typical power consumption 52.81W 77.19W

bus

Clock speed 2,000 MHz 2,000 MHz

details

Phenom II X4 905e  vs
840 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 2 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
L3 cache 6 MB 0 MB
L3 cache per core 1.5 MB/core 0 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.82 - 1.25V 0.85 - 1.4V
Operating temperature Unknown - 70°C Unknown - 71°C

overclocking

Overclocked clock speed 3.41 GHz 3.94 GHz
Overclocked clock speed (Water) 2.5 GHz 3.2 GHz
Overclocked clock speed (Air) 3.41 GHz 3.94 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A
AMD Phenom II X4 905e
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AMD Phenom II X4 840
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