SSDBoss Review Our evaluation of 840 Pro vs 520

read performance

How quickly data is read from the drive

840 Pro
6.6
Intel 520
5.7
4K Random Read, 4K Random Read Access Time and 512K Sequential Read

write performance

How quickly data is written to the drive

840 Pro
7.0
Intel 520
6.6
4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

840 Pro
8.1
Intel 520
7.6
Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy

Benchmarks

How well the drive performs on common benchmarks

840 Pro
7.6
Intel 520
7.5
Passmark Disk Rating, PCMark Vantage, AS SSD Score and 1 more

SSDBoss Score

read performance, write performance, real world benchmarks and Benchmarks

840 Pro
7.1
Intel 520
6.7

Winner
Samsung 840 Pro 

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

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Differences What are the advantages of each

Front view of Samsung 840 Pro

Reasons to consider the
Samsung 840 Pro

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Significantly faster 4k random read 311.34 MB/s vs 88.59 MB/s More than 3.5x faster 4k random read
Higher capacity 512 GB vs 240 GB Around 2.2x higher capacity
Faster 4k random write 130.58 MB/s vs 81.39 MB/s More than 60% faster 4k random write
Significantly faster windows 7 boot-up time 7.8 s vs 11.3 s More than 30% faster windows 7 boot-up time
Significantly larger cache 256 MB vs 0 MB Compared to all SSDs, 256 MB cache is just OK
Much lower 4k random read access time 0.8 ms vs 2.82 ms 3.5x lower 4k random read access time
Higher AS SSD score 1,143 pts vs 742 pts Around 55% higher AS SSD score
Significantly lower avg. power consumption 2 Watts vs 2.66 Watts Around 25% lower avg. power consumption
Lighter 53 g vs 78 g More than 30% lighter
Faster tom's storage bench application 733 pts vs 629 pts More than 15% faster tom's storage bench application
Lower 4k random write access time 1.91 ms vs 3.08 ms Around 40% lower 4k random write access time
Faster AS SSD ISO copy 429.47 MB/s vs 262.98 MB/s Around 65% faster AS SSD ISO copy
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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Slightly more capacity per dollar 2 GB/$ vs 1.83 GB/$ Around 10% more capacity per dollar

Benchmarks Real world tests of 840 Pro vs Intel 520

4K Random Read

840 Pro
311.34 MB/s
Intel 520
88.59 MB/s

4K Random Write

840 Pro
130.58 MB/s
Intel 520
81.39 MB/s

Windows 7 Boot-up Time

840 Pro
7.8 s
Intel 520
11.3 s

Avg. Power Consumption

840 Pro
2 Watts
Intel 520
2.66 Watts

4K Random Read Access Time

840 Pro
1.91 ms
Intel 520
3.08 ms

4K Random Write Access Time

840 Pro
0.8 ms
Intel 520
2.82 ms

Reviews Word on the street

840 Pro  vs Intel 520 

8.0
8.0
The random read/write performance data from SiSoft Sandra that we also quote is a measure of a drive's sustained performance when reading and writing a contiguous block of information to a randomly chosen location.
840 Pro

8.0
7.6
So the big difference in terms of performance you can likely trace to the flash memory in each drive.
840 Pro

Overall

8.7 Out of 10
8.2 Out of 10

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