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Differences What are the advantages of each

Front view of Intel Xeon L5638

Reasons to consider the
Intel Xeon L5638

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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 107.5W 2.2x 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
Significantly better performance per watt 8.43 pt/W vs 4.69 pt/W Around 80% better performance per watt
Significantly higher Maximum operating temperature 85 °C vs 67.4 °C More than 25% higher Maximum operating temperature
More cores 6 vs 4 2 more cores; run more applications at once
Much lower annual home energy cost 14.45 $/year vs 38.81 $/year 2.7x 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 106 $/year 2x 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 3570K

Reasons to consider the
Intel Core i5 3570K

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Much higher clock speed 3.4 GHz vs 2 GHz 70% higher clock speed
Much higher turbo clock speed 3.8 GHz vs 2.4 GHz Around 60% higher turbo clock speed
Much better performance per dollar 3.09 pt/$ vs 0.88 pt/$ More than 3.5x better performance per dollar
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much better overclocked clock speed (Air) 4.59 GHz vs 2 GHz More than 2.2x better overclocked clock speed (Air)
Much better PassMark (Single core) score 2,012 vs 942 Around 2.2x better PassMark (Single core) score
Better PassMark score 7,152 vs 5,556 Around 30% better PassMark score
Newer Apr, 2012 vs Mar, 2010 Release date over 2 years later
Much better overclocked clock speed (Water) 4.71 GHz vs 3.03 GHz More than 55% better overclocked clock speed (Water)

Benchmarks Real world tests of Xeon L5638 vs Core i5 3570K

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L5638
15,681
Core i5 3570K
10,311

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L5638
965,300 MB/s
Core i5 3570K
2,650,000 MB/s

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon L5638  vs
Core i5 3570K 
Clock speed 2 GHz 3.4 GHz
Turbo clock speed 2.4 GHz 3.8 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

power consumption

TDP 60W 77W
Annual home energy cost 14.45 $/year 38.81 $/year
Annual commercial energy cost 52.56 $/year 106 $/year
Performance per watt 8.43 pt/W 4.69 pt/W
Typical power consumption 48.75W 107.5W

details

Xeon L5638  vs
Core i5 3570K 
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 22 nm
Max CPUs 2 1
Operating temperature Unknown - 85°C Unknown - 67.4°C

overclocking

Overclocked clock speed 2 GHz 4.59 GHz
Overclocked clock speed (Water) 3.03 GHz 4.71 GHz
Overclocked clock speed (Air) 2 GHz 4.59 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 4000
Latest DirectX N/A 10.x
Number of displays supported N/A 3
GPU clock speed N/A 650 MHz
Turbo clock speed N/A 1,150 MHz
3DMark06 N/A 5,339.9

bus

Architecture QPI DMI
Number of links 2 1
Transfer rate 5,860 MT/s 5,000 MT/s
Intel Xeon L5638
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Intel Core i5 3570K
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