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Differences What are the advantages of each

Front view of Intel Xeon X5550

Reasons to consider the
Intel Xeon X5550

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Significantly higher clock speed 2.66 GHz vs 2.4 GHz More than 10% higher clock speed
Much better overclocked clock speed (Air) 3.72 GHz vs 2.4 GHz Around 55% better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.23 GHz vs 2.4 GHz More than 75% better overclocked clock speed (Water)
Front view of Intel Xeon 5600 L5645

Reasons to consider the
Intel Xeon 5600 L5645

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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
Much more l3 cache 12 MB vs 8 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
More cores 6 vs 4 2 more cores; run more applications at once
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More threads 12 vs 8 4 more threads
Significantly lower typical power consumption 48.75W vs 77.19W More than 35% lower typical power consumption
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Significantly lower annual commercial energy cost 52.56 $/year vs 83.22 $/year More than 35% lower annual commercial energy cost
Significantly lower annual home energy cost 14.45 $/year vs 22.89 $/year More than 35% lower annual home energy cost

Features Key features of the Xeon X5550  vs 5600 L5645 

clock speed

Xeon X5550
2.66 GHz
Xeon 5600 L5645
2.4 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon X5550
3.72 GHz
Xeon 5600 L5645
2.4 GHz

overclocked clock speed (water)

Xeon X5550
4.23 GHz
Xeon 5600 L5645
2.4 GHz

Specifications Full list of technical specs

summary

Xeon X5550  vs
5600 L5645 
Clock speed 2.66 GHz 2.4 GHz
Cores Quad core Hexa core
Socket type
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing No Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI QPI
Number of links 2 2
Data rate 51,200 MB/s 46,928 MB/s
Transfer rate 6,400 MT/s 5,860 MT/s
Clock speed 3,200 MHz 2,933 MHz

details

Xeon X5550  vs
5600 L5645 
Threads 8 12
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 8 MB 12 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 2 2

overclocking

Overclocked clock speed 3.72 GHz 2.4 GHz
Overclocked clock speed (Water) 4.23 GHz 2.4 GHz
Overclocked clock speed (Air) 3.72 GHz 2.4 GHz

power consumption

TDP 95W 60W
Annual home energy cost 22.89 $/year 14.45 $/year
Annual commercial energy cost 83.22 $/year 52.56 $/year
Typical power consumption 77.19W 48.75W
Intel Xeon X5550
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Intel Xeon 5600 L5645
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