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Differences What are the advantages of each

Front view of Intel Xeon E7520

Reasons to consider the
Intel Xeon E7520

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Much more l3 cache 18 MB vs 12 MB 50% more l3 cache; more data can be stored in the l3 cache for quick access later
Much more l3 cache per core 4.5 MB/core vs 2 MB/core 2.2x more l3 cache per core
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Much higher clock speed 2.4 GHz vs 1.87 GHz Around 30% higher clock speed
Much higher turbo clock speed 2.67 GHz vs 1.87 GHz Around 45% higher turbo clock speed
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
More cores 6 vs 4 2 more cores; run more applications at once
Much better overclocked clock speed (Air) 3.39 GHz vs 1.87 GHz More than 80% better overclocked clock speed (Air)
More threads 12 vs 8 4 more threads
Newer manufacturing process 32 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Lower typical power consumption 65W vs 77.19W More than 15% lower typical power consumption
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) 2.4 GHz vs 1.87 GHz Around 30% better overclocked clock speed (Water)
Lower annual commercial energy cost 70.08 $/year vs 83.22 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 22.89 $/year More than 15% lower annual home energy cost

Features Key features of the Xeon E7520  vs E5645 

clock speed

Xeon E7520
1.87 GHz
Xeon E5645
2.4 GHz

turbo clock speed

Xeon E7520
1.87 GHz
Xeon E5645
2.67 GHz

L2 cache

L3 cache

Xeon E7520
18 MB
Xeon E5645
12 MB

overclocked clock speed (air)

Xeon E7520
1.87 GHz
Xeon E5645
3.39 GHz

overclocked clock speed (water)

Xeon E7520
1.87 GHz
Xeon E5645
2.4 GHz

Specifications Full list of technical specs

summary

Xeon E7520  vs
E5645 
Clock speed 1.87 GHz 2.4 GHz
Turbo clock speed 1.87 GHz 2.67 GHz
Cores Quad 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 80W
Annual home energy cost 22.89 $/year 19.27 $/year
Annual commercial energy cost 83.22 $/year 70.08 $/year
Typical power consumption 77.19W 65W

bus

Architecture QPI QPI
Number of links 4 2
Data rate 76,800 MB/s 46,928 MB/s
Transfer rate 4,800 MT/s 5,860 MT/s
Clock speed 2,400 MHz 2,930 MHz

details

Xeon E7520  vs
E5645 
Threads 8 12
L2 cache 1 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 18 MB 12 MB
L3 cache per core 4.5 MB/core 2 MB/core
Manufacture process 45 nm 32 nm
Max CPUs 4 2
Voltage range 0.68 - 1.35V 0.75 - 1.35V
Operating temperature Unknown - 70°C Unknown - 76.2°C

overclocking

Overclocked clock speed 1.87 GHz 3.39 GHz
Overclocked clock speed (Water) 1.87 GHz 2.4 GHz
Overclocked clock speed (Air) 1.87 GHz 3.39 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
Intel Xeon E7520
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Intel Xeon E5645
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