SSDBoss Review Our evaluation of 840 vs 520

read performance

How quickly data is read from the drive

4K Random Read, 4K Random Read Access Time and 512K Sequential Read

write performance

How quickly data is written to the drive

4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy


How well the drive performs on common benchmarks

Passmark Disk Rating, PCMark Vantage, AS SSD Score and 1 more

SSDBoss Score

read performance, write performance, real world benchmarks and Benchmarks

Samsung 840 

SSDBoss recommends the Samsung 840  based on its read performance and real world benchmarks.

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Differences What are the advantages of each

Front view of Samsung 840

Reasons to consider the
Samsung 840

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Significantly faster 4k random read 303.68 MB/s vs 88.59 MB/s Around 3.5x faster 4k random read
Significantly larger cache 256 MB vs 0 MB Compared to all SSDs, 256 MB cache is just OK
Faster windows 7 boot-up time 9.3 s vs 11.3 s Around 20% faster windows 7 boot-up time
Much lower 4k random read access time 0.82 ms vs 2.82 ms 3.4x lower 4k random read access time
Much lower avg. power consumption 1.69 Watts vs 2.66 Watts More than 35% lower avg. power consumption
Lighter 53 g vs 78 g More than 30% lighter
Higher AS SSD score 1,010 pts vs 742 pts More than 35% higher AS SSD score
Higher MTBF 1,500,000 hours vs 1,200,000 hours 25% higher MTBF
Thinner thickness 7 mm vs 10 mm More than 25% thinner thickness
Front view of Intel 520

Reasons to consider the
Intel 520

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Significantly faster 512K sequential write 486.3 MB/s vs 248.62 MB/s More than 95% faster 512K sequential write
Higher passmark rating 3,909 pts vs 2,563 pts Around 55% higher passmark rating
Faster tom's storage bench application 629 pts vs 469 pts Around 35% faster tom's storage bench application
Higher PCMark vantage score 25,952 pts vs 23,328 pts More than 10% higher PCMark vantage score
Faster AS SSD ISO copy 262.98 MB/s vs 188.99 MB/s Around 40% faster AS SSD ISO copy

Benchmarks Real world tests of Samsung 840 vs Intel 520

4K Random Read

Samsung 840
303.68 MB/s
Intel 520
88.59 MB/s

4K Random Write

Samsung 840
76.07 MB/s
Intel 520
81.39 MB/s

Windows 7 Boot-up Time

Samsung 840
9.3 s
Intel 520
11.3 s

Avg. Power Consumption

Samsung 840
1.69 Watts
Intel 520
2.66 Watts

4K Random Read Access Time

Samsung 840
3.29 ms
Intel 520
3.08 ms

4K Random Write Access Time

Samsung 840
0.82 ms
Intel 520
2.82 ms

Reviews Word on the street

Samsung 840  vs Intel 520 

New dense NAND isn't quite as fast as established technology.
Samsung 840

When you consider that smaller drives fail faster in such conditions, well, it's pretty impressive.
Intel 520


8.3 Out of 10
8.2 Out of 10

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