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Differences What are the advantages of each

Front view of Intel Core i7 875K

Reasons to consider the
Intel Core i7 875K

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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
Significantly higher clock speed 2.93 GHz vs 1.8 GHz Around 65% higher clock speed
Much better geekbench 3 Multi-Core score 9,946 vs 4,726 More than 2x better geekbench 3 Multi-Core score
Much better geekbench 3 single core score 2,349 vs 689.5 Around 3.5x better geekbench 3 single core score
Much better overclocked clock speed (Air) 4.1 GHz vs 1.8 GHz More than 2.2x better overclocked clock speed (Air)
Newer Apr, 2010 vs Jan, 2005 Release date over 5 years later
More threads 8 vs 2 6 more threads
More cores 4 vs 2 Twice as many cores; run more applications at once
Better performance per watt 2.32 pt/W vs 0.75 pt/W More than 3x better performance per watt
Much better overclocked clock speed (Water) 4.09 GHz vs 1.8 GHz More than 2.2x better overclocked clock speed (Water)
Higher Maximum operating temperature 72.7 °C vs 67 °C Around 10% higher Maximum operating temperature
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
Significantly 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
Much more l2 cache per core 1 MB/core vs 0.25 MB/core 4x more l2 cache per core
Lower typical power consumption 69.06W vs 77.19W More than 10% lower typical power consumption
Lower annual commercial energy cost 74.46 $/year vs 83.22 $/year More than 10% lower annual commercial energy cost
Lower annual home energy cost 20.48 $/year vs 22.89 $/year More than 10% lower annual home energy cost

Benchmarks Real world tests of Core i7 875K vs Opteron 865

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

Core i7 875K
160,300 MB/s
Opteron 865
44.55 MB/s

Specifications Full list of technical specs

summary

Core i7 875K  vs
Opteron 865 
Clock speed 2.93 GHz 1.8 GHz
Cores Quad core Dual core
Socket type
LGA 1156
940

features

Has a NX bit Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
Supports dynamic frequency scaling Yes Yes

details

Core i7 875K  vs
Opteron 865 
Threads 8 2
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 1 MB/core
Manufacture process 45 nm 90 nm
Max CPUs 1 8
Clock multiplier 22 9
Voltage range 0.65 - 1.4V 1 - UnknownV
Operating temperature Unknown - 72.7°C 0 - 67°C

overclocking

Overclocked clock speed 4.1 GHz 1.8 GHz
Overclocked clock speed (Water) 4.09 GHz 1.8 GHz
Overclocked clock speed (Air) 4.1 GHz 1.8 GHz

power consumption

TDP 95W 85W
Annual home energy cost 22.89 $/year 20.48 $/year
Annual commercial energy cost 83.22 $/year 74.46 $/year
Performance per watt 2.32 pt/W 0.75 pt/W
Typical power consumption 77.19W 69.06W
Intel Core i7 875K
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AMD Opteron 865
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