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Differences What are the advantages of each

Front view of Intel Xeon 5120

Reasons to consider the
Intel Xeon 5120

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Much more l2 cache 4 MB vs 1 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 65 nm vs 90 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much more l2 cache per core 2 MB/core vs 0.5 MB/core 4x more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Significantly better geekbench 3 Multi-Core score 3,487 vs 1,295 Around 2.8x better geekbench 3 Multi-Core score
Better geekbench 3 single core score 1,011 vs 705 Around 45% better geekbench 3 single core score
Better overclocked clock speed (Water) 2.2 GHz vs 1.8 GHz More than 20% better overclocked clock speed (Water)
Front view of AMD Athlon 64 X2 3400+

Reasons to consider the
AMD Athlon 64 X2 3400+

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Significantly lower typical power consumption 28.44W vs 52.81W More than 45% lower typical power consumption
Higher Maximum operating temperature 78 °C vs 65 °C 20% higher Maximum operating temperature
Significantly lower annual home energy cost 8.43 $/year vs 15.66 $/year More than 45% lower annual home energy cost
Significantly lower annual commercial energy cost 30.66 $/year vs 56.94 $/year More than 45% lower annual commercial energy cost

Benchmarks Real world tests of Xeon 5120 vs Athlon 64 X2 3400+

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

Xeon 5120
96.45 MB/s
Athlon 64 X2 3400+
48.7 MB/s

Specifications Full list of technical specs

summary

Xeon 5120  vs
Athlon 64 X2 3400+ 
Clock speed 1.86 GHz 1.8 GHz
Cores Dual core Dual core
Socket type
LGA 771
AM2

features

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

details

Xeon 5120  vs
Athlon 64 X2 3400+ 
Threads 2 2
L2 cache 4 MB 1 MB
L2 cache per core 2 MB/core 0.5 MB/core
Manufacture process 65 nm 90 nm
Max CPUs 2 1
Operating temperature Unknown - 65°C Unknown - 78°C

overclocking

Overclocked clock speed 2.2 GHz 2.25 GHz
Overclocked clock speed (Water) 2.2 GHz 1.8 GHz
PassMark (Overclocked) 1,163.6 1,253.7
Overclocked clock speed (Air) 2.2 GHz 2.25 GHz

power consumption

TDP 65W 35W
Annual home energy cost 15.66 $/year 8.43 $/year
Annual commercial energy cost 56.94 $/year 30.66 $/year
Performance per watt 0.95 pt/W 0.85 pt/W
Typical power consumption 52.81W 28.44W
Intel Xeon 5120
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AMD Athlon 64 X2 3400+
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