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Differences What are the advantages of each

Front view of Intel Xeon E5-4650L

Reasons to consider the
Intel Xeon E5-4650L

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Significantly higher clock speed 2.6 GHz vs 2.4 GHz Around 10% higher clock speed
Higher turbo clock speed 3.1 GHz vs 2.8 GHz More than 10% higher turbo clock speed
Better overclocked clock speed (Air) 2.79 GHz vs 2.63 GHz More than 5% better overclocked clock speed (Air)
Significantly better overclocked clock speed (Water) 2.6 GHz vs 2.4 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Xeon E5-4640

Reasons to consider the
Intel Xeon E5-4640

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Much better PassMark (Single core) score 1,423 vs 1,367 Around 5% better PassMark (Single core) score
Lower typical power consumption 77.19W vs 93.44W More than 15% lower typical power consumption
Lower annual commercial energy cost 83.22 $/year vs 100.74 $/year More than 15% lower annual commercial energy cost
Lower annual home energy cost 22.89 $/year vs 27.7 $/year More than 15% lower annual home energy cost

Benchmarks Real world tests of Xeon E5-4650L vs E5-4640

PassMark Data courtesy Passmark

Xeon E5-4650L
11,821
Xeon E5-4640
10,523

PassMark (Single Core)

Specifications Full list of technical specs

summary

Xeon E5-4650L  vs
E5-4640 
Clock speed 2.6 GHz 2.4 GHz
Turbo clock speed 3.1 GHz 2.8 GHz
Cores Octa core Octa core
Socket type
LGA 2011

features

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

power consumption

TDP 115W 95W
Annual home energy cost 27.7 $/year 22.89 $/year
Annual commercial energy cost 100.74 $/year 83.22 $/year
Performance per watt 2.77 pt/W 1.83 pt/W
Typical power consumption 93.44W 77.19W

bus

Architecture QPI QPI
Number of links 2 2
Data rate 64,000 MB/s 64,000 MB/s
Transfer rate 8,000 MT/s 8,000 MT/s
Clock speed 4,000 MHz 4,000 MHz

details

Xeon E5-4650L  vs
E5-4640 
Architecture x86-64 x86-64
Threads 16 16
L2 cache 2 MB 2 MB
L2 cache per core 0.25 MB/core 0.25 MB/core
L3 cache 20 MB 20 MB
L3 cache per core 2.5 MB/core 2.5 MB/core
Manufacture process 32 nm 32 nm
Max CPUs 4 4
Voltage range 0.6 - 1.35V 0.6 - 1.35V

overclocking

Overclocked clock speed 2.79 GHz 2.63 GHz
Overclocked clock speed (Water) 2.6 GHz 2.4 GHz
Overclocked clock speed (Air) 2.79 GHz 2.63 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
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Quad Channel Quad Channel
Supports ECC Yes Yes
Maximum bandwidth 51,200 MB/s 51,200 MB/s
Maximum memory size 393,216 MB 393,216 MB
Intel Xeon E5-4650L
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Intel Xeon E5-4640
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