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Differences What are the advantages of each

Front view of Intel Core i5 520UM

Reasons to consider the
Intel Core i5 520UM

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Much better 3DMark06 CPU score 1,492 vs 19.9 Around 75x better 3DMark06 CPU score
Much better geekbench 3 AES single core score 765,150 MB/s vs 279,050 MB/s Around 2.8x better geekbench 3 AES single core score
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
Front view of Intel Atom x5 x5-Z8300

Reasons to consider the
Intel Atom x5 x5-Z8300

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Is unlocked Yes vs No Somewhat common; An unlocked multiplier allows for easier overclocking
Significantly more l2 cache 2 MB vs 1 MB 2x more l2 cache; more data can be stored in the l2 cache for quick access later
Much newer manufacturing process 14 nm vs 32 nm A newer manufacturing process allows for a more powerful, yet cooler running processor
Higher clock speed 1.44 GHz vs 1.07 GHz Around 35% higher clock speed
Newer Apr, 2015 vs Jan, 2010 Release date over 5 years later
More cores 4 vs 2 Twice as many cores; run more applications at once
Better overclocked clock speed (Air) 1.53 GHz vs 1.07 GHz Around 45% better overclocked clock speed (Air)
Slightly higher GPU clock speed 200 MHz vs 166 MHz More than 20% higher GPU clock speed
Better overclocked clock speed (Water) 1.44 GHz vs 1.07 GHz Around 35% better overclocked clock speed (Water)

Benchmarks Real world tests of Core i5 520UM vs Atom x5 x5-Z8300

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

Core i5 520UM
765,150 MB/s
Atom x5 x5-Z8300
279,050 MB/s

3D Mark 06 (CPU)

PassMark Data courtesy Passmark

PassMark (Single Core)

Specifications Full list of technical specs

summary

Core i5 520UM  vs
Atom x5 x5-Z8300 
Clock speed 1.07 GHz 1.44 GHz
Turbo clock speed 1.87 GHz 1.84 GHz
Cores Dual core Quad core
Is unlocked No Yes

features

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

power consumption

Typical power consumption 14.63W N/A

bus

Architecture DMI FSB
Number of links 1 1

details

Core i5 520UM  vs
Atom x5 x5-Z8300 
Architecture x86-64 x86-64
Threads 4 4
L2 cache 1 MB 2 MB
L2 cache per core 0.5 MB/core 0.5 MB/core
Manufacture process 32 nm 14 nm
Max CPUs 1 1

overclocking

Overclocked clock speed 1.07 GHz 1.53 GHz
Overclocked clock speed (Water) 1.07 GHz 1.44 GHz
Overclocked clock speed (Air) 1.07 GHz 1.53 GHz

integrated graphics

GPU GPU GPU
Label Intel® HD Graphics Intel® HD Graphics
Number of displays supported 2 2
GPU clock speed 166 MHz 200 MHz

memory controller

Memory controller Built-in Built-in
Memory type
DDR3-800
DDR3
Channels Dual Channel Single Channel
Maximum bandwidth 12,800 MB/s 6,400 MB/s
Maximum memory size 8,192 MB 2,048 MB
Intel Core i5 520UM
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Intel Atom x5 x5-Z8300
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