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Differences What are the advantages of each

Front view of Intel Xeon D-1521

Reasons to consider the
Intel Xeon D-1521

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Higher clock speed 2.4 GHz vs 2.2 GHz Around 10% higher clock speed
Slightly better overclocked clock speed (Air) 2.4 GHz vs 2.2 GHz Around 10% better overclocked clock speed (Air)
Newer Oct, 2015 vs Mar, 2015 Release date 6 months later
Slightly better overclocked clock speed (Water) 2.4 GHz vs 2.2 GHz Around 10% better overclocked clock speed (Water)
Front view of Intel Xeon D-1520

Reasons to consider the
Intel Xeon D-1520

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Better performance per dollar 1.05 pt/$ vs 0.81 pt/$ More than 30% better performance per dollar
Better performance per watt 4.65 pt/W vs 3.57 pt/W More than 30% better performance per watt

Benchmarks Real world tests of Xeon D-1521 vs D-1520

PassMark Data courtesy Passmark

Xeon D-1521
6,980
Xeon D-1520
6,396

PassMark (Single Core)

Xeon D-1521
1,441
Xeon D-1520
1,398

Specifications Full list of technical specs

summary

Xeon D-1521  vs
D-1520 
Clock speed 2.4 GHz 2.2 GHz
Turbo clock speed 2.7 GHz 2.6 GHz
Cores Quad core Quad core

features

Has a NX bit Yes Yes
Supports trusted computing Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
AES
AVX
AVX 2.0
Supports dynamic frequency scaling Yes Yes

power consumption

TDP 45W 45W
Annual home energy cost 10.84 $/year 10.84 $/year
Annual commercial energy cost 39.42 $/year 39.42 $/year
Performance per watt 3.57 pt/W 4.65 pt/W
Typical power consumption 36.56W 36.56W

bus

Architecture FSB DMI 2.0
Number of links 1 1

details

Xeon D-1521  vs
D-1520 
Architecture x86-64 x86-64
Threads 8 8
Manufacture process 14 nm 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 2.4 GHz 2.2 GHz
Overclocked clock speed (Water) 2.4 GHz 2.2 GHz
Overclocked clock speed (Air) 2.4 GHz 2.2 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
Channels Dual Channel Dual Channel
Supports ECC Yes Yes
Maximum memory size 131,072 MB 131,072 MB
Intel Xeon D-1521
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Intel Xeon D-1520
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