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Differences What are the advantages of each

Front view of Intel Xeon E5645

Reasons to consider the
Intel Xeon E5645

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Higher clock speed 2.4 GHz vs 2.1 GHz Around 15% higher clock speed
More l3 cache 12 MB vs 8 MB 50% 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
More cores 6 vs 4 2 more cores; run more applications at once
More threads 12 vs 8 4 more threads
Supports more RAM 294,912 MB vs 65,536 MB Supports 4.5x more RAM
Better overclocked clock speed (Air) 3.39 GHz vs 3.1 GHz Around 10% better overclocked clock speed (Air)
Front view of Intel Xeon E3-1240L v5

Reasons to consider the
Intel Xeon E3-1240L v5

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Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher turbo clock speed 3.2 GHz vs 2.67 GHz Around 20% higher turbo clock speed
Much lower typical power consumption 20.31W vs 65W 3.2x lower typical power consumption
Newer Oct, 2015 vs Mar, 2010 Release date over 5 years later
Much lower annual home energy cost 6.02 $/year vs 19.27 $/year 3.2x lower annual home energy cost
Much lower annual commercial energy cost 21.9 $/year vs 70.08 $/year 3.2x lower annual commercial energy cost
Better overclocked clock speed (Water) 3.1 GHz vs 2.4 GHz Around 30% better overclocked clock speed (Water)

Features Key features of the Xeon E5645  vs E3-1240L v5 

clock speed

Xeon E5645
2.4 GHz

turbo clock speed

Xeon E5645
2.67 GHz

L3 cache

overclocked clock speed (air)

Xeon E5645
3.39 GHz

overclocked clock speed (water)

Xeon E5645
2.4 GHz

Specifications Full list of technical specs

summary

Xeon E5645  vs
E3-1240L v5 
Clock speed 2.4 GHz 2.1 GHz
Turbo clock speed 2.67 GHz 3.2 GHz
Cores Hexa core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing 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 80W 25W
Annual home energy cost 19.27 $/year 6.02 $/year
Annual commercial energy cost 70.08 $/year 21.9 $/year
Typical power consumption 65W 20.31W

bus

Architecture QPI FSB
Number of links 2 1
Transfer rate 5,860 MT/s 8,000 MT/s

details

Xeon E5645  vs
E3-1240L v5 
Architecture x86-64 x86-64
Threads 12 8
L3 cache 12 MB 8 MB
L3 cache per core 2 MB/core 2 MB/core
Manufacture process 32 nm 14 nm
Max CPUs 2 1
Voltage range 0.75 - 1.35V 0.55 - 1.52V

overclocking

Overclocked clock speed 3.39 GHz 3.1 GHz
Overclocked clock speed (Water) 2.4 GHz 3.1 GHz
Overclocked clock speed (Air) 3.39 GHz 3.1 GHz

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
DDR3-1333
DDR3-1066
DDR3L-1333
DDR3
DDR3-800
Channels Triple Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 31,999.98 MB/s 12,800 MB/s
Maximum memory size 294,912 MB 65,536 MB
Intel Xeon E5645
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Intel Xeon E3-1240L v5
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