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Differences What are the advantages of each

Front view of Intel Xeon L7555

Reasons to consider the
Intel Xeon L7555

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Much more l3 cache 24 MB vs 12 MB 2x more l3 cache; more data can be stored in the l3 cache for quick access later
More threads 16 vs 12 4 more threads
Supports more CPUs in SMP configuration 8 vs 2 6 supports more CPUs in SMP configuration
Much more l3 cache per core 3 MB/core vs 2 MB/core 50% more l3 cache per core
Front view of Intel Xeon L5640

Reasons to consider the
Intel Xeon L5640

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Much higher clock speed 2.26 GHz vs 1.87 GHz More than 20% higher clock speed
Much better overclocked clock speed (Air) 3.9 GHz vs 1.87 GHz More than 2x better overclocked clock speed (Air)
Much better performance per watt 10.46 pt/W vs 2.79 pt/W More than 3.8x better performance per watt
Higher turbo clock speed 2.8 GHz vs 2.53 GHz More than 10% higher turbo clock speed
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
Much better overclocked clock speed (Water) 2.27 GHz vs 1.87 GHz More than 20% better overclocked clock speed (Water)
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

Benchmarks Real world tests of Xeon L7555 vs L5640

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Xeon L7555
16,824
Xeon L5640
16,852

GeekBench 3 (Single core) Data courtesy Primate Labs

Xeon L7555
1,386
Xeon L5640
1,918

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon L7555
114,400 MB/s
Xeon L5640
1,250,000 MB/s

Specifications Full list of technical specs

summary

Xeon L7555  vs
L5640 
Clock speed 1.87 GHz 2.26 GHz
Turbo clock speed 2.53 GHz 2.8 GHz
Cores Octa core Hexa core
Socket type
LGA 1567
LGA 1366

features

Has a NX bit 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

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
Performance per watt 2.79 pt/W 10.46 pt/W
Typical power consumption 77.19W 48.75W

details

Xeon L7555  vs
L5640 
Threads 16 12
L2 cache 2 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 24 MB 12 MB
L3 cache per core 3 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 8 2
Voltage range 0.68 - 1.35V 0.75 - 1.35V
Operating temperature Unknown - 70°C Unknown - 69.4°C

overclocking

Overclocked clock speed 1.87 GHz 3.9 GHz
Overclocked clock speed (Water) 1.87 GHz 2.27 GHz
Overclocked clock speed (Air) 1.87 GHz 3.9 GHz

integrated graphics

GPU None None
Label N/A N/A
Latest DirectX N/A N/A
Number of displays supported N/A N/A
GPU clock speed N/A N/A
Turbo clock speed N/A N/A
3DMark06 N/A N/A

bus

Architecture QPI QPI
Number of links 4 2
Data rate 93,856 MB/s 46,928 MB/s
Transfer rate 5,860 MT/s 5,860 MT/s
Clock speed 2,930 MHz 2,930 MHz
Intel Xeon L7555
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Intel Xeon L5640
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