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Differences What are the advantages of each

Front view of Intel Xeon E5540

Reasons to consider the
Intel Xeon E5540

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Much higher clock speed 2.53 GHz vs 2 GHz More than 25% higher clock speed
Much better overclocked clock speed (Air) 3.57 GHz vs 2 GHz Around 80% better overclocked clock speed (Air)
More l3 cache 8 MB vs 6 MB Around 35% more l3 cache; more data can be stored in the l3 cache for quick access later
Much better overclocked clock speed (Water) 4.45 GHz vs 2 GHz Around 2.2x better overclocked clock speed (Water)
Supports more RAM 147,456 MB vs 32,768 MB Supports 4.5x more RAM
More l3 cache per core 2 MB/core vs 1.5 MB/core Around 35% more l3 cache per core
Supports more CPUs in SMP configuration 2 vs 1 Twice as many CPUs in SMP configuration
Front view of Intel Xeon E3-1278L v4

Reasons to consider the
Intel Xeon E3-1278L v4

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Significantly higher turbo clock speed 3.3 GHz vs 2.8 GHz Around 20% higher turbo clock speed
Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
Significantly newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Significantly lower typical power consumption 38.19W vs 65W More than 40% lower typical power consumption
Newer Apr, 2015 vs Mar, 2009 Release date over 6 years later
Significantly lower annual commercial energy cost 41.17 $/year vs 70.08 $/year More than 40% lower annual commercial energy cost
Significantly lower annual home energy cost 11.32 $/year vs 19.27 $/year More than 40% lower annual home energy cost

Features Key features of the Xeon E5540  vs E3-1278L v4 

clock speed

Xeon E5540
2.53 GHz

turbo clock speed

Xeon E5540
2.8 GHz

L3 cache

overclocked clock speed (air)

Xeon E5540
3.57 GHz

overclocked clock speed (water)

Xeon E5540
4.45 GHz

Specifications Full list of technical specs

summary

Xeon E5540  vs
E3-1278L v4 
Clock speed 2.53 GHz 2 GHz
Turbo clock speed 2.8 GHz 3.3 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing No 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 80W 47W
Annual home energy cost 19.27 $/year 11.32 $/year
Annual commercial energy cost 70.08 $/year 41.17 $/year
Typical power consumption 65W 38.19W

bus

Architecture QPI DMI
Number of links 2 1
Transfer rate 5,860 MT/s 5,000 MT/s

details

Xeon E5540  vs
E3-1278L v4 
Architecture x86-64 x86-64
Threads 8 8
L3 cache 8 MB 6 MB
L3 cache per core 2 MB/core 1.5 MB/core
Manufacture process 45 nm 14 nm
Max CPUs 2 1

overclocking

Overclocked clock speed 3.57 GHz 2 GHz
Overclocked clock speed (Water) 4.45 GHz 2 GHz
Overclocked clock speed (Air) 3.57 GHz 2 GHz

integrated graphics

GPU None GPU
Label N/A Intel® Iris™ Pro Graphics P6300
Number of displays supported N/A 3
GPU clock speed N/A 800 MHz
Turbo clock speed N/A 1,000 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1066
DDR3-800
DDR3
Channels Triple Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 25,599.99 MB/s 12,800 MB/s
Maximum memory size 147,456 MB 32,768 MB
Intel Xeon E5540
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Intel Xeon E3-1278L v4
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