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Differences What are the advantages of each

Front view of Intel Xeon E6540

Reasons to consider the
Intel Xeon E6540

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Significantly 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
Significantly more l3 cache 18 MB vs 8 MB 2.2x more l3 cache; more data can be stored in the l3 cache for quick access later
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Significantly more l3 cache per core 3 MB/core vs 2 MB/core 50% more l3 cache per core
More cores 6 vs 4 2 more cores; run more applications at once
More threads 12 vs 8 4 more threads
More l2 cache per core 0.33 MB/core vs 0.25 MB/core Around 35% more l2 cache per core
Front view of Intel Core i7 6700

Reasons to consider the
Intel Core i7 6700

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Much higher turbo clock speed 4 GHz vs 2.27 GHz More than 75% higher turbo clock speed
Much higher clock speed 3.4 GHz vs 2 GHz 70% higher clock speed
Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Much lower typical power consumption 52.81W vs 85.31W Around 40% lower typical power consumption
Much better overclocked clock speed (Air) 3.98 GHz vs 2 GHz Around 2x better overclocked clock speed (Air)
Newer Jul, 2015 vs Mar, 2010 Release date over 5 years later
Much better overclocked clock speed (Water) 4.18 GHz vs 2 GHz More than 2x better overclocked clock speed (Water)
Much lower annual home energy cost 15.66 $/year vs 25.29 $/year Around 40% lower annual home energy cost
Much lower annual commercial energy cost 56.94 $/year vs 91.98 $/year Around 40% lower annual commercial energy cost

Features Key features of the Xeon E6540  vs Core i7 6700 

clock speed

Xeon E6540
2 GHz
Core i7 6700
3.4 GHz

turbo clock speed

Xeon E6540
2.27 GHz
Core i7 6700
4 GHz

L2 cache

L3 cache

overclocked clock speed (air)

Xeon E6540
2 GHz
Core i7 6700
3.98 GHz

overclocked clock speed (water)

Xeon E6540
2 GHz
Core i7 6700
4.18 GHz

Specifications Full list of technical specs

summary

Xeon E6540  vs
Core i7 6700 
Clock speed 2 GHz 3.4 GHz
Turbo clock speed 2.27 GHz 4 GHz
Cores Hexa core Quad core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 105W 65W
Annual home energy cost 25.29 $/year 15.66 $/year
Annual commercial energy cost 91.98 $/year 56.94 $/year
Typical power consumption 85.31W 52.81W

details

Xeon E6540  vs
Core i7 6700 
Threads 12 8
L2 cache 2 MB 1 MB
L2 cache per core 0.33 MB/core 0.25 MB/core
L3 cache 18 MB 8 MB
L3 cache per core 3 MB/core 2 MB/core
Manufacture process 45 nm 14 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 2 GHz 3.98 GHz
Overclocked clock speed (Water) 2 GHz 4.18 GHz
Overclocked clock speed (Air) 2 GHz 3.98 GHz

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 530
Number of displays supported N/A 3
GPU clock speed N/A 350 MHz
Turbo clock speed N/A 1,150 MHz

bus

Architecture QPI FSB
Number of links 4 1
Transfer rate 6,400 MT/s 8,000 MT/s
Intel Xeon E6540
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Intel Core i7 6700
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