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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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Significantly 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 lower typical power consumption 48.75W vs 112.55W 2.3x lower typical power consumption
More l3 cache 12 MB vs 6 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
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 41.29 $/year 2.9x lower annual home energy cost
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Much lower annual commercial energy cost 52.56 $/year vs 110.03 $/year 2.1x lower annual commercial energy cost
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Front view of Intel Core i5 2500K

Reasons to consider the
Intel Core i5 2500K

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Significantly higher clock speed 3.3 GHz vs 2.4 GHz Around 40% higher clock speed
Much better overclocked clock speed (Air) 4.98 GHz vs 2.4 GHz More than 2x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.88 GHz vs 2.4 GHz More than 2x better overclocked clock speed (Water)

Features Key features of the Xeon 5600 L5645  vs Core i5 2500K 

clock speed

Xeon 5600 L5645
2.4 GHz
Core i5 2500K
3.3 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon 5600 L5645
2.4 GHz
Core i5 2500K
4.98 GHz

overclocked clock speed (water)

Xeon 5600 L5645
2.4 GHz
Core i5 2500K
4.88 GHz

Specifications Full list of technical specs

summary

Xeon 5600 L5645  vs
Core i5 2500K 
Clock speed 2.4 GHz 3.3 GHz
Cores Hexa core Quad core
Socket type
LGA 1366
LGA 1155

features

Has a NX bit Yes Yes
Supports trusted computing Yes No
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
EM64T
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling Yes Yes

bus

Architecture QPI DMI
Number of links 2 1
Transfer rate 5,860 MT/s 5,000 MT/s

details

Xeon 5600 L5645  vs
Core i5 2500K 
Threads 12 4
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 12 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 2.4 GHz 4.98 GHz
Overclocked clock speed (Water) 2.4 GHz 4.88 GHz
Overclocked clock speed (Air) 2.4 GHz 4.98 GHz

power consumption

TDP 60W 95W
Annual home energy cost 14.45 $/year 41.29 $/year
Annual commercial energy cost 52.56 $/year 110.03 $/year
Typical power consumption 48.75W 112.55W
Intel Xeon 5600 L5645
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Intel Core i5 2500K
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