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Differences What are the advantages of each

Front view of Intel Xeon E7-4820

Reasons to consider the
Intel Xeon E7-4820

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Supports more RAM 2,097,152 MB vs 393,216 MB Supports more than 5.2x more RAM
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
More threads 16 vs 12 4 more threads
Supports more CPUs in SMP configuration 4 vs 2 Twice as many CPUs in SMP configuration
Front view of Intel Xeon E5-2640

Reasons to consider the
Intel Xeon E5-2640

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Much higher clock speed 2.5 GHz vs 2 GHz 25% higher clock speed
Much higher turbo clock speed 3 GHz vs 2.27 GHz More than 30% higher turbo clock speed
Lower typical power consumption 77.19W vs 85.31W Around 10% 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
More l3 cache per core 2.5 MB/core vs 2.25 MB/core More than 10% more l3 cache per core
Newer Mar, 2012 vs Apr, 2011 Release date 11 months later
Lower annual commercial energy cost 83.22 $/year vs 91.98 $/year Around 10% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 25.29 $/year Around 10% lower annual home energy cost

Features Key features of the Xeon E7-4820  vs E5-2640 

clock speed

Xeon E7-4820
2 GHz
Xeon E5-2640
2.5 GHz

turbo clock speed

Xeon E7-4820
2.27 GHz
Xeon E5-2640
3 GHz

L2 cache

L3 cache


Specifications Full list of technical specs


Xeon E7-4820  vs
Clock speed 2 GHz 2.5 GHz
Turbo clock speed 2.27 GHz 3 GHz
Cores Octa core Hexa core
Socket type
LGA 1567
LGA 2011


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

power consumption

TDP 105W 95W
Annual home energy cost 25.29 $/year 22.89 $/year
Annual commercial energy cost 91.98 $/year 83.22 $/year
Typical power consumption 85.31W 77.19W


Architecture QPI QPI
Number of links 1 2
Data rate 23,464 MB/s 57,600 MB/s
Transfer rate 5,860 MT/s 7,200 MT/s
Clock speed 2,930 MHz 3,600 MHz


Xeon E7-4820  vs
Architecture x86-64 x86-64
Threads 16 12
L2 cache 2 MB 2 MB
L2 cache per core 0.25 MB/core 0.33 MB/core
L3 cache 18 MB 15 MB
L3 cache per core 2.25 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 4 2
Clock multiplier 15 30
Operating temperature Unknown - 64°C Unknown - 73°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
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 25,600 MB/s 42,666.64 MB/s
Maximum memory size 2,097,152 MB 393,216 MB
Intel Xeon E7-4820
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Intel Xeon E5-2640
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