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Differences What are the advantages of each

Front view of Intel Xeon E5 1620 v2

Reasons to consider the
Intel Xeon E5 1620 v2

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Much better performance per dollar 5.78 pt/$ vs 0.81 pt/$ Around 7.2x better performance per dollar
Much higher clock speed 3.7 GHz vs 2.4 GHz Around 55% higher clock speed
Significantly higher turbo clock speed 3.9 GHz vs 2.7 GHz Around 45% higher turbo clock speed
Much better geekbench 3 Multi-Core score 12,932 vs 5,222 Around 2.5x better geekbench 3 Multi-Core score
Much better performance per watt 13.06 pt/W vs 3.57 pt/W Around 3.8x better performance per watt
Much better overclocked clock speed (Air) 4.21 GHz vs 2.4 GHz More than 75% better overclocked clock speed (Air)
Better geekbench 3 single core score 3,262 vs 2,726 Around 20% better geekbench 3 single core score
Much better overclocked clock speed (Water) 4.03 GHz vs 2.4 GHz Around 70% better overclocked clock speed (Water)
Supports more RAM 262,144 MB vs 131,072 MB Supports 2x more RAM
Front view of Intel Xeon D-1521

Reasons to consider the
Intel Xeon D-1521

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Much lower typical power consumption 36.56W vs 105.63W 2.9x lower typical power consumption
Supports dynamic frequency scaling Yes vs No Somewhat common; Allows for maximum performance when needed, while conserving power and minimizing heat production when not needed
Significantly newer manufacturing process 14 nm vs 22 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower annual home energy cost 10.84 $/year vs 31.32 $/year 2.9x lower annual home energy cost
Much lower annual commercial energy cost 39.42 $/year vs 113.88 $/year 2.9x lower annual commercial energy cost
Newer Oct, 2015 vs Jul, 2013 Release date over 2 years later

Benchmarks Real world tests of Xeon E5 1620 v2 vs D-1521

GeekBench 3 (Multi-core) Data courtesy Primate Labs

GeekBench 3 (Single core) Data courtesy Primate Labs

GeekBench 3 (AES single core) Data courtesy Primate Labs

Xeon E5 1620 v2
2,650,000 MB/s
Xeon D-1521
3,140 MB/s

Specifications Full list of technical specs

summary

Xeon E5 1620 v2  vs
D-1521 
Clock speed 3.7 GHz 2.4 GHz
Turbo clock speed 3.9 GHz 2.7 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
SSE2
F16C
MMX
SSE4
AVX
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
AVX 2.0
Supports dynamic frequency scaling No Yes

power consumption

TDP 130W 45W
Annual home energy cost 31.32 $/year 10.84 $/year
Annual commercial energy cost 113.88 $/year 39.42 $/year
Performance per watt 13.06 pt/W 3.57 pt/W
Typical power consumption 105.63W 36.56W

bus

Number of links 0 1

details

Xeon E5 1620 v2  vs
D-1521 
Architecture x86-64 x86-64
Threads 8 8
Manufacture process 22 nm 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.21 GHz 2.4 GHz
Overclocked clock speed (Water) 4.03 GHz 2.4 GHz
Overclocked clock speed (Air) 4.21 GHz 2.4 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
DDR3-1866
DDR3-1600
DDR3-1333
DDR3-1066
DDR3
DDR3-800
Channels Quad Channel Dual Channel
Supports ECC Yes Yes
Maximum bandwidth 59,733.32 MB/s 12,800 MB/s
Maximum memory size 262,144 MB 131,072 MB
Intel Xeon E5 1620 v2
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Intel Xeon D-1521
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