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Differences What are the advantages of each

Front view of Intel Xeon X5670

Reasons to consider the
Intel Xeon X5670

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Higher clock speed 2.93 GHz vs 2.3 GHz More than 25% higher clock speed
Much newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.29 GHz vs 2.3 GHz More than 85% better overclocked clock speed (Air)
Lower typical power consumption 77.19W vs 93.44W More than 15% lower typical power consumption
More threads 12 vs 8 4 more threads
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much better overclocked clock speed (Water) 4.5 GHz vs 2.3 GHz More than 95% better overclocked clock speed (Water)
Lower annual home energy cost 22.89 $/year vs 27.7 $/year More than 15% lower annual home energy cost
Lower annual commercial energy cost 83.22 $/year vs 100.74 $/year More than 15% lower annual commercial energy cost
Front view of AMD Opteron 61QS

Reasons to consider the
AMD Opteron 61QS

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Much more l2 cache 4 MB vs 2 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
More cores 8 vs 6 2 more cores; run more applications at once
More l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core

Features Key features of the Xeon X5670  vs Opteron 61QS 

clock speed

Xeon X5670
2.93 GHz
Opteron 61QS
2.3 GHz

L2 cache

L3 cache

Xeon X5670
12 MB
Opteron 61QS
12 MB

overclocked clock speed (air)

Xeon X5670
4.29 GHz
Opteron 61QS
2.3 GHz

overclocked clock speed (water)

Xeon X5670
4.5 GHz
Opteron 61QS
2.3 GHz

TDP

Specifications Full list of technical specs

summary

Xeon X5670  vs
Opteron 61QS 
Clock speed 2.93 GHz 2.3 GHz
Cores Hexa core Octa core
Socket type
LGA 1366
G34

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE4a
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
3DNow!
Supplemental SSE3
AES

bus

Architecture QPI HyperTransport 3.0
Clock speed 3,200 MHz 3,200 MHz

details

Xeon X5670  vs
Opteron 61QS 
Threads 12 8
L2 cache 2 MB 4 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 12 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 45 nm
Max CPUs 2 4
Clock multiplier 22 11
Voltage range 0.75 - 1.35V 1 - UnknownV

overclocking

Overclocked clock speed 4.29 GHz 2.3 GHz
Overclocked clock speed (Water) 4.5 GHz 2.3 GHz
Overclocked clock speed (Air) 4.29 GHz 2.3 GHz

power consumption

TDP 95W 115W
Annual home energy cost 22.89 $/year 27.7 $/year
Annual commercial energy cost 83.22 $/year 100.74 $/year
Typical power consumption 77.19W 93.44W
Intel Xeon X5670
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AMD Opteron 61QS
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