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Differences What are the advantages of each

Front view of Intel Xeon X5675

Reasons to consider the
Intel Xeon X5675

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Much higher clock speed 3.06 GHz vs 1.73 GHz More than 75% higher clock speed
Much more l2 cache 2 MB vs 0.25 MB 8x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 32 nm vs 180 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More cores 6 vs 1 5 more cores; run more applications at once
Much better PassMark score 8,527 vs 323 Around 26.5x better PassMark score
Much better PassMark (Single core) score 1,405 vs 503 More than 2.8x better PassMark (Single core) score
Much better overclocked clock speed (Air) 4.29 GHz vs 2.13 GHz More than 2x better overclocked clock speed (Air)
More threads 12 vs 1 11 more threads
Much better performance per watt 8.89 pt/W vs 0.62 pt/W Around 14.5x better performance per watt
Has a NX bit Yes vs No Somewhat common; Prevents a common class of security exploits
Much better overclocked clock speed (Water) 4.77 GHz vs 1.73 GHz More than 2.8x better overclocked clock speed (Water)
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Front view of AMD Athlon MP 2100+

Reasons to consider the
AMD Athlon MP 2100+

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Significantly lower typical power consumption 45.83W vs 77.19W More than 40% lower typical power consumption
Significantly lower annual commercial energy cost 49.41 $/year vs 83.22 $/year More than 40% lower annual commercial energy cost
Significantly lower annual home energy cost 13.59 $/year vs 22.89 $/year More than 40% lower annual home energy cost

Benchmarks Real world tests of Xeon X5675 vs Athlon MP 2100+

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon X5675  vs
Athlon MP 2100+ 
Clock speed 3.06 GHz 1.73 GHz
Cores Hexa core Single core
Socket type
LGA 1366
462
563

features

Has a NX bit Yes No
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Clock speed 3,200 MHz 266 MHz

details

Xeon X5675  vs
Athlon MP 2100+ 
Threads 12 1
L2 cache 2 MB 0.25 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
Manufacture process 32 nm 180 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 4.29 GHz 2.13 GHz
Overclocked clock speed (Water) 4.77 GHz 1.73 GHz
Overclocked clock speed (Air) 4.29 GHz 2.13 GHz

power consumption

TDP 95W 56.4W
Annual home energy cost 22.89 $/year 13.59 $/year
Annual commercial energy cost 83.22 $/year 49.41 $/year
Performance per watt 8.89 pt/W 0.62 pt/W
Typical power consumption 77.19W 45.83W
Intel Xeon X5675
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AMD Athlon MP 2100+
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