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Differences What are the advantages of each

Front view of Intel Core i3 3120M

Reasons to consider the
Intel Core i3 3120M

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Much newer manufacturing process 22 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 2.5 GHz vs 2 GHz 25% higher clock speed
Much lower typical power consumption 28.44W vs 77.19W 2.7x lower typical power consumption
Significantly better geekbench 3 single core score 1,922 vs 797 Around 2.5x better geekbench 3 single core score
Newer Sep, 2012 vs Apr, 2005 Release date over 7 years later
Significantly higher Maximum operating temperature 90 °C vs 67 °C Around 35% higher Maximum operating temperature
Significantly better performance per watt 3.96 pt/W vs 0.68 pt/W More than 5.8x better performance per watt
Better overclocked clock speed (Air) 2.53 GHz vs 2 GHz More than 25% better overclocked clock speed (Air)
Much lower annual home energy cost 8.43 $/year vs 22.89 $/year 2.7x lower annual home energy cost
Much lower annual commercial energy cost 30.66 $/year vs 83.22 $/year 2.7x lower annual commercial energy cost
More threads 4 vs 2 Twice as many threads
Better overclocked clock speed (Water) 2.5 GHz vs 2 GHz 25% better overclocked clock speed (Water)
Front view of AMD Opteron 870

Reasons to consider the
AMD Opteron 870

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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 0.5 MB/core 2x more l2 cache per core

Benchmarks Real world tests of Core i3 3120M vs Opteron 870

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 i3 3120M
131,100 MB/s
Opteron 870
54.4 MB/s

Specifications Full list of technical specs

summary

Core i3 3120M  vs
Opteron 870 
Clock speed 2.5 GHz 2 GHz
Cores Dual core Dual core
Socket type
rPGA 988B
940

features

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

details

Core i3 3120M  vs
Opteron 870 
Threads 4 2
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 1 MB/core
Manufacture process 22 nm 90 nm
Max CPUs 1 8
Clock multiplier 25 10
Operating temperature Unknown - 90°C 0 - 67°C

overclocking

Overclocked clock speed 2.53 GHz 2 GHz
Overclocked clock speed (Water) 2.5 GHz 2 GHz
Overclocked clock speed (Air) 2.53 GHz 2 GHz

power consumption

TDP 35W 95W
Annual home energy cost 8.43 $/year 22.89 $/year
Annual commercial energy cost 30.66 $/year 83.22 $/year
Performance per watt 3.96 pt/W 0.68 pt/W
Typical power consumption 28.44W 77.19W
Intel Core i3 3120M
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AMD Opteron 870
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