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Differences What are the advantages of each

Front view of Intel Xeon 5600 L5645

Reasons to consider the
Intel Xeon 5600 L5645

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Much newer manufacturing process 32 nm vs 65 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 48.75W vs 85.31W Around 45% lower typical power consumption
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
More threads 12 vs 4 Three times as many threads
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
More cores 6 vs 4 2 more cores; run more applications at once
Much lower annual home energy cost 14.45 $/year vs 25.29 $/year Around 45% lower annual home energy cost
Much lower annual commercial energy cost 52.56 $/year vs 91.98 $/year Around 45% lower annual commercial energy cost
Front view of Intel Core2 Quad Q6600

Reasons to consider the
Intel Core2 Quad Q6600

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Much more l2 cache 8 MB vs 2 MB 4x more l2 cache; more data can be stored in the l2 cache for quick access later
Much more l2 cache per core 2 MB/core vs 0.33 MB/core More than 6x more l2 cache per core
Significantly better overclocked clock speed (Air) 3.52 GHz vs 2.4 GHz More than 45% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 3.6 GHz vs 2.4 GHz More than 50% better overclocked clock speed (Water)

Features Key features of the Xeon 5600 L5645  vs Core2 Quad Q6600 

clock speed

L2 cache

overclocked clock speed (air)

overclocked clock speed (water)

Specifications Full list of technical specs

summary

Xeon 5600 L5645  vs
Core2 Quad Q6600 
Clock speed 2.4 GHz 2.4 GHz
Cores Hexa core Quad core
Socket type
LGA 1366
LGA 775

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
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 FSB
Number of links 2 1
Clock speed 2,933 MHz 1,066 MHz

details

Xeon 5600 L5645  vs
Core2 Quad Q6600 
Threads 12 4
L2 cache 2 MB 8 MB
L2 cache per core 0.33 MB/core 2 MB/core
Manufacture process 32 nm 65 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 2.4 GHz 3.52 GHz
Overclocked clock speed (Water) 2.4 GHz 3.6 GHz
Overclocked clock speed (Air) 2.4 GHz 3.52 GHz

power consumption

TDP 60W 105W
Annual home energy cost 14.45 $/year 25.29 $/year
Annual commercial energy cost 52.56 $/year 91.98 $/year
Typical power consumption 48.75W 85.31W
Intel Xeon 5600 L5645
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Intel Core2 Quad Q6600
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