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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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Significantly more l3 cache 18 MB vs 15 MB 20% more l3 cache; more data can be stored in the l3 cache for quick access later
Supports more RAM 1,048,576 MB vs 786,432 MB Supports around 35% more RAM
More threads 16 vs 12 4 more threads
Front view of Intel Xeon E5-2620 v3

Reasons to consider the
Intel Xeon E5-2620 v3

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Much higher turbo clock speed 3.2 GHz vs 2.27 GHz More than 40% higher turbo clock speed
Much higher clock speed 2.4 GHz vs 2 GHz Around 20% higher clock speed
Lower typical power consumption 69.06W vs 85.31W Around 20% lower typical power consumption
Newer manufacturing process 22 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
More l3 cache per core 2.5 MB/core vs 2.25 MB/core More than 10% more l3 cache per core
Newer Jul, 2014 vs Apr, 2011 Release date over 3 years later
Lower annual commercial energy cost 74.46 $/year vs 91.98 $/year Around 20% lower annual commercial energy cost
Lower annual home energy cost 20.48 $/year vs 25.29 $/year Around 20% lower annual home energy cost

Features Key features of the Xeon E7-2820  vs E5-2620 v3 

clock speed

turbo clock speed

Xeon E7-2820
2.27 GHz
Xeon E5-2620 v3
3.2 GHz

L3 cache

Specifications Full list of technical specs


Xeon E7-2820  vs
E5-2620 v3 
Clock speed 2 GHz 2.4 GHz
Turbo clock speed 2.27 GHz 3.2 GHz
Cores Octa core Hexa core


Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
Supplemental SSE3
AVX 2.0
Supports dynamic frequency scaling Yes Yes

memory controller

Memory controller Built-in Built-in
Memory type
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 6,400 MB/s
Maximum memory size 1,048,576 MB 786,432 MB


Xeon E7-2820  vs
E5-2620 v3 
Architecture x86-64 x86-64
Threads 16 12
L3 cache 18 MB 15 MB
L3 cache per core 2.25 MB/core 2.5 MB/core
Manufacture process 32 nm 22 nm
Max CPUs 2 2
Operating temperature Unknown - 64°C Unknown - 72.6°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

power consumption

TDP 105W 85W
Annual home energy cost 25.29 $/year 20.48 $/year
Annual commercial energy cost 91.98 $/year 74.46 $/year
Typical power consumption 85.31W 69.06W


Architecture QPI QPI
Number of links 1 2
Data rate 23,464 MB/s 64,000 MB/s
Transfer rate 5,860 MT/s 8,000 MT/s
Clock speed 2,930 MHz 4,000 MHz
Intel Xeon E7-2820
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Intel Xeon E5-2620 v3
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