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Differences What are the advantages of each

Front view of AMD Phenom II X2 550

Reasons to consider the
AMD Phenom II X2 550

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Front view of AMD Athlon II X2 265

Reasons to consider the
AMD Athlon II X2 265

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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
Higher clock speed 3.3 GHz vs 3.1 GHz More than 5% higher clock speed
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Significantly lower typical power consumption 102.72W vs 124.5W More than 15% lower typical power consumption
Significantly higher Maximum operating temperature 74 °C vs 70 °C More than 5% higher Maximum operating temperature
Much lower annual home energy cost 36.79 $/year vs 46.25 $/year More than 20% lower annual home energy cost
Better overclocked clock speed (Air) 3.86 GHz vs 3.81 GHz Almost the same
Significantly lower annual commercial energy cost 101.7 $/year vs 120.89 $/year More than 15% lower annual commercial energy cost
Better overclocked clock speed (Water) 3.3 GHz vs 3.12 GHz More than 5% better overclocked clock speed (Water)
Newer Sep, 2010 vs Nov, 2009 Release date 10 months later

Benchmarks Real world tests of Phenom II X2 550 vs Athlon II X2 265

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 X2 550
125,000 MB/s
Athlon II X2 265
133,500 MB/s

GeekBench (32-bit) Data courtesy Primate Labs

GeekBench

Cinebench R10 32-Bit

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Phenom II X2 550  vs
Athlon II X2 265 
Clock speed 3.1 GHz 3.3 GHz
Cores Dual core Dual core
Socket type
AM3
Is unlocked Yes 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 80W 65W
Annual home energy cost 46.25 $/year 36.79 $/year
Annual commercial energy cost 120.89 $/year 101.7 $/year
Performance per watt 0.89 pt/W 1.11 pt/W
Idle power consumption 84W 62.6W
Peak power consumption 138W 116.1W
Typical power consumption 124.5W 102.72W

details

Phenom II X2 550  vs
Athlon II X2 265 
Architecture x86-64 x86-64
Threads 2 2
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
L3 cache 6 MB 1 MB
L3 cache per core 3 MB/core 0.5 MB/core
Manufacture process 45 nm 45 nm
Max CPUs 1 1
Voltage range 0.85 - 1.43V 0.82 - 1.4V
Operating temperature Unknown - 70°C Unknown - 74°C

overclocking

Overclocked clock speed 3.81 GHz 3.86 GHz
Overclocked clock speed (Water) 3.12 GHz 3.3 GHz
Overclocked clock speed (Air) 3.81 GHz 3.86 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

bus

Clock speed 2,000 MHz 2,000 MHz
AMD Phenom II X2 550
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AMD Athlon II X2 265
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