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Differences What are the advantages of each

Front view of Intel Xeon X5650

Reasons to consider the
Intel Xeon X5650

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Much higher clock speed 2.66 GHz vs 2 GHz Around 35% higher clock speed
Much more l3 cache 12 MB vs 4 MB 3x more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 6 vs 2 Three times as many cores; run more applications at once
Much 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
More threads 12 vs 2 10 more threads
Much better overclocked clock speed (Air) 3.84 GHz vs 2 GHz More than 90% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.64 GHz vs 2 GHz More than 2.2x better overclocked clock speed (Water)
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Front view of Intel Xeon 3400 L3403

Reasons to consider the
Intel Xeon 3400 L3403

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Much lower typical power consumption 24.38W vs 77.19W 3.2x lower typical power consumption
Significantly more l2 cache per core 0.5 MB/core vs 0.33 MB/core More than 50% more l2 cache per core
Much lower annual commercial energy cost 26.28 $/year vs 83.22 $/year 3.2x lower annual commercial energy cost
Much lower annual home energy cost 7.23 $/year vs 22.89 $/year 3.2x lower annual home energy cost

Features Key features of the Xeon X5650  vs 3400 L3403 

clock speed

Xeon X5650
2.66 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon X5650
3.84 GHz

overclocked clock speed (water)

Xeon X5650
4.64 GHz

Specifications Full list of technical specs

summary

Xeon X5650  vs
3400 L3403 
Clock speed 2.66 GHz 2 GHz
Cores Hexa core Dual core
Socket type
LGA 1366
LGA 1156

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI DMI
Transfer rate 6,400 MT/s 2,500 MT/s

details

Xeon X5650  vs
3400 L3403 
Threads 12 2
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.5 MB/core
L3 cache 12 MB 4 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 3.84 GHz 2 GHz
Overclocked clock speed (Water) 4.64 GHz 2 GHz
Overclocked clock speed (Air) 3.84 GHz 2 GHz

power consumption

TDP 95W 30W
Annual home energy cost 22.89 $/year 7.23 $/year
Annual commercial energy cost 83.22 $/year 26.28 $/year
Typical power consumption 77.19W 24.38W
Intel Xeon X5650
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Intel Xeon 3400 L3403
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