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Differences What are the advantages of each

Front view of Intel Atom C2518

Reasons to consider the
Intel Atom C2518

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More cores 4 vs 2 Twice as many cores; run more applications at once
More threads 4 vs 2 Twice as many threads
Front view of Intel 3855U

Reasons to consider the
Intel 3855U

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Has a built-in GPU Yes vs No Somewhat common; A separate graphics adapter is not required
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
Significantly better geekbench 3 single core score 1,758 vs 769 More than 2.2x better geekbench 3 single core score
Significantly better performance per dollar 0.72 pt/$ vs 0.46 pt/$ More than 55% better performance per dollar
Better performance per watt 5.17 pt/W vs 3.24 pt/W Around 60% better performance per watt
Newer Oct, 2015 vs Jul, 2013 Release date over 2 years later
Better geekbench 3 Multi-Core score 2,869 vs 2,369 More than 20% better geekbench 3 Multi-Core score

Benchmarks Real world tests of Atom C2518 vs 3855U

GeekBench 3 (Multi-core) Data courtesy Primate Labs

Atom C2518
2,369
3855U
2,869

GeekBench 3 (Single core) Data courtesy Primate Labs

3855U
1,758

GeekBench 3 (AES single core) Data courtesy Primate Labs

Atom C2518
289.5 MB/s
3855U
2,220 MB/s

Specifications Full list of technical specs

summary

Atom C2518  vs
3855U 
Clock speed 1.7 GHz 1.6 GHz
Cores Quad core Dual core

features

Has a NX bit Yes Yes
Has virtualization support Yes Yes
Instruction set extensions
SSE2
MMX
SSE4
SSE3
SSE
SSE4.1
SSE4.2
Supplemental SSE3
AES
Supports dynamic frequency scaling No Yes

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-1866
DDR3
LPDDR3-1600
Channels Dual Channel Dual Channel
Supports ECC Yes No
Maximum bandwidth 12,800 MB/s 29,866.66 MB/s
Maximum memory size 32,768 MB 32,768 MB

details

Atom C2518  vs
3855U 
Architecture x86-64 x86-64
Threads 4 2
Manufacture process 22 nm 14 nm
Max CPUs 1 1

integrated graphics

GPU None GPU
Label N/A Intel® HD Graphics 510
Number of displays supported N/A 3
GPU clock speed N/A 300 MHz
Turbo clock speed N/A 900 MHz

power consumption

TDP 13W 15W
Annual home energy cost 3.13 $/year 3.61 $/year
Annual commercial energy cost 11.39 $/year 13.14 $/year
Performance per watt 3.24 pt/W 5.17 pt/W
Typical power consumption 10.56W 12.19W

bus

Architecture FSB FSB
Number of links 1 1
Intel Atom C2518
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Intel 3855U
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