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Differences What are the advantages of each

Front view of Intel Xeon W3520

Reasons to consider the
Intel Xeon W3520

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Much higher clock speed 2.66 GHz vs 1.3 GHz More than 2x higher clock speed
Higher turbo clock speed 2.93 GHz vs 2.1 GHz Around 40% higher turbo clock speed
Much better overclocked clock speed (Air) 4.38 GHz vs 1.3 GHz More than 3.2x better overclocked clock speed (Air)
Much better overclocked clock speed (Water) 4.46 GHz vs 1.3 GHz Around 3.5x better overclocked clock speed (Water)
Front view of Intel D-1577

Reasons to consider the
Intel D-1577

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Much newer manufacturing process 14 nm vs 45 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Much lower typical power consumption 36.56W vs 105.63W 2.9x lower typical power consumption
More cores 16 vs 4 12 more cores; run more applications at once
More threads 32 vs 8 24 more threads
Supports trusted computing Yes vs No Somewhat common; Allows for safer, more reliable computing
Newer Jan, 2016 vs Mar, 2009 Release date over 6 years later
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
Supports more RAM 131,072 MB vs 24,576 MB Supports more than 5.2x more RAM

Features Key features of the Xeon W3520  vs D-1577 

clock speed

Xeon W3520
2.66 GHz
D-1577
1.3 GHz

turbo clock speed

Xeon W3520
2.93 GHz
D-1577
2.1 GHz

overclocked clock speed (air)

Xeon W3520
4.38 GHz
D-1577
1.3 GHz

overclocked clock speed (water)

Xeon W3520
4.46 GHz
D-1577
1.3 GHz

TDP

Xeon W3520
130W
D-1577
45W

Specifications Full list of technical specs

summary

Xeon W3520  vs
D-1577 
Clock speed 2.66 GHz 1.3 GHz
Turbo clock speed 2.93 GHz 2.1 GHz
Cores Quad core 16 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 130W 45W
Annual home energy cost 31.32 $/year 10.84 $/year
Annual commercial energy cost 113.88 $/year 39.42 $/year
Typical power consumption 105.63W 36.56W

bus

Architecture QPI FSB
Number of links 1 1

details

Xeon W3520  vs
D-1577 
Architecture x86-64 x86-64
Threads 8 32
Manufacture process 45 nm 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 4.38 GHz 1.3 GHz
Overclocked clock speed (Water) 4.46 GHz 1.3 GHz
Overclocked clock speed (Air) 4.38 GHz 1.3 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
DDR3-1066
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 24,576 MB 131,072 MB
Intel Xeon W3520
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Intel D-1577
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