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Differences What are the advantages of each

Front view of AMD Opteron 865

Reasons to consider the
AMD Opteron 865

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Supports more CPUs in SMP configuration 8 vs 1 7 supports more CPUs in SMP configuration
Much lower typical power consumption 77.19W vs 122.78W More than 35% lower typical power consumption
Much more l2 cache per core 1 MB/core vs 0.5 MB/core 2x more l2 cache per core
Much lower annual home energy cost 22.89 $/year vs 44.01 $/year Around 50% lower annual home energy cost
Much lower annual commercial energy cost 83.22 $/year vs 121.5 $/year More than 30% lower annual commercial energy cost
Front view of AMD Athlon II X4 645

Reasons to consider the
AMD Athlon II X4 645

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Much newer manufacturing process 45 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much higher clock speed 3.1 GHz vs 1.8 GHz More than 70% higher clock speed
Much better overclocked clock speed (Air) 3.67 GHz vs 1.8 GHz More than 2x better overclocked clock speed (Air)
Newer Sep, 2010 vs Apr, 2005 Release date over 5 years later
Significantly better geekbench 3 single core score 1,587 vs 689.5 More than 2.2x better geekbench 3 single core score
More cores 4 vs 2 Twice as many cores; run more applications at once
Better geekbench 3 Multi-Core score 5,422 vs 4,726 Around 15% better geekbench 3 Multi-Core score
More threads 4 vs 2 Twice as many threads
Significantly better overclocked clock speed (Water) 3.1 GHz vs 1.8 GHz More than 70% better overclocked clock speed (Water)
Higher Maximum operating temperature 71 °C vs 67 °C More than 5% higher Maximum operating temperature

Benchmarks Real world tests of Opteron 865 vs Athlon II X4 645

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

Opteron 865
44.55 MB/s
Athlon II X4 645
124,500 MB/s

Specifications Full list of technical specs

summary

Opteron 865  vs
Athlon II X4 645 
Clock speed 1.8 GHz 3.1 GHz
Cores Dual core Quad core
Socket type
940
AM3

features

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

details

Opteron 865  vs
Athlon II X4 645 
Threads 2 4
L2 cache 2 MB 2 MB
L2 cache per core 1 MB/core 0.5 MB/core
Manufacture process 90 nm 45 nm
Max CPUs 8 1
Voltage range 1 - UnknownV 1.05 - 1.4V
Operating temperature 0 - 67°C Unknown - 71°C

overclocking

Overclocked clock speed 1.8 GHz 3.67 GHz
Overclocked clock speed (Water) 1.8 GHz 3.1 GHz
Overclocked clock speed (Air) 1.8 GHz 3.67 GHz

power consumption

TDP 95W 95W
Annual home energy cost 22.89 $/year 44.01 $/year
Annual commercial energy cost 83.22 $/year 121.5 $/year
Performance per watt 0.67 pt/W 1.08 pt/W
Typical power consumption 77.19W 122.78W
AMD Opteron 865
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AMD Athlon II X4 645
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