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Differences What are the advantages of each

Front view of Intel Xeon E7-2820

Reasons to consider the
Intel Xeon E7-2820

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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
Supports more RAM 1,048,576 MB vs 294,912 MB Supports more than 3.5x more RAM
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 8 vs 4 Twice as many cores; run more applications at once
More threads 16 vs 8 Twice as many threads
Newer Apr, 2011 vs Mar, 2010 Release date over 1 years later
Front view of Intel Xeon E5620

Reasons to consider the
Intel Xeon E5620

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Much higher clock speed 2.4 GHz vs 2 GHz Around 20% higher clock speed
Significantly higher turbo clock speed 2.66 GHz vs 2.27 GHz More than 15% higher turbo clock speed
Lower typical power consumption 65W vs 85.31W Around 25% lower typical power consumption
Significantly more l3 cache per core 3 MB/core vs 2.25 MB/core Around 35% more l3 cache per core
Lower annual commercial energy cost 70.08 $/year vs 91.98 $/year Around 25% lower annual commercial energy cost
Lower annual home energy cost 19.27 $/year vs 25.29 $/year Around 25% lower annual home energy cost

Features Key features of the Xeon E7-2820  vs E5620 

clock speed

Xeon E7-2820
2 GHz
Xeon E5620
2.4 GHz

turbo clock speed

Xeon E7-2820
2.27 GHz
Xeon E5620
2.66 GHz

L2 cache

L3 cache

Xeon E7-2820
18 MB
Xeon E5620
12 MB

TDP

Specifications Full list of technical specs

summary

Xeon E7-2820  vs
E5620 
Clock speed 2 GHz 2.4 GHz
Turbo clock speed 2.27 GHz 2.66 GHz
Cores Octa core Quad core
Socket type
LGA 1567
LGA 1366

features

Has a NX bit Yes Yes
Supports trusted computing 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 105W 80W
Annual home energy cost 25.29 $/year 19.27 $/year
Annual commercial energy cost 91.98 $/year 70.08 $/year
Typical power consumption 85.31W 65W

bus

Architecture QPI QPI
Number of links 1 2
Data rate 23,464 MB/s 46,928 MB/s
Transfer rate 5,860 MT/s 5,860 MT/s
Clock speed 2,930 MHz 2,930 MHz

details

Xeon E7-2820  vs
E5620 
Architecture x86-64 x86-64
Threads 16 8
L2 cache 2 MB 1 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 18 MB 12 MB
L3 cache per core 2.25 MB/core 3 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 2 2
Clock multiplier 15 18
Operating temperature Unknown - 64°C Unknown - 77.6°C

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

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3
DDR3-800
DDR
Channels Quad Channel Triple Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 25,599.99 MB/s
Maximum memory size 1,048,576 MB 294,912 MB
Intel Xeon E7-2820
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Intel Xeon E5620
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