SSDBoss Review Our evaluation of 840 EVO vs 520

read performance

How quickly data is read from the drive

840 EVO
9.5
Intel 520
7.4
4K Random Read, 4K Random Read Access Time and 512K Sequential Read

write performance

How quickly data is written to the drive

840 EVO
9.1
Intel 520
8.6
4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

840 EVO
9.6
Intel 520
8.8
Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy

Benchmarks

How well the drive performs on common benchmarks

840 EVO
8.4
Intel 520
7.5
PCMark Vantage and AS SSD Score

No winner declared

Too close to call

Differences What are the advantages of each

Sibling view of Samsung 840 EVO

Reasons to consider the
Samsung 840 EVO

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Much higher capacity 1,000 GB vs 240 GB Around 4.2x higher capacity
Much faster 4k random read 318.8 MB/s vs 88.59 MB/s More than 3.5x faster 4k random read
Much larger cache 1,000 MB vs 0 MB Compared to all SSDs, 1,000 MB cache is just OK
Faster 4k random write 106.65 MB/s vs 81.39 MB/s More than 30% faster 4k random write
Faster windows 7 boot-up time 9.3 s vs 11.3 s Around 20% faster windows 7 boot-up time
Significantly higher AS SSD score 1,198 pts vs 742 pts More than 60% higher AS SSD score
Significantly faster AS SSD ISO copy 441.16 MB/s vs 262.98 MB/s Around 70% faster AS SSD ISO copy
Significantly lower 4k random read access time 0.78 ms vs 2.82 ms 3.6x lower 4k random read access time
Lighter 53 g vs 78 g More than 30% lighter
Lower avg. power consumption 2.29 Watts vs 2.66 Watts Around 15% lower avg. power consumption
More capacity per dollar 2.3 GB/$ vs 2 GB/$ More than 15% more capacity per dollar
Higher MTBF 1,500,000 hours vs 1,200,000 hours 25% higher MTBF
Lower 4k random write access time 2.34 ms vs 3.08 ms Around 25% lower 4k random write access time
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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Faster photoshop lens filter 55.9 s vs 56.6 s Almost the same

Benchmarks Real world tests of 840 EVO vs Intel 520

4K Random Read

840 EVO
318.8 MB/s
Intel 520
88.59 MB/s
840 EVO 520 @ ssdreview.com
TurboWrite does a good job of blurring the lines between MLC and TLC performance, while Samsung's RAPID DRAM cache offers adventurous users a way of getting a taste of high-end PCIe SSD performance out of an affordable TLC SATA drive.
840 EVO | by Anand-Lal-Shimpi (Jul, 2013)

4K Random Write

840 EVO
106.65 MB/s
Intel 520
81.39 MB/s
840 EVO 520 @ ssdreview.com
The performance story is really good (particularly with the larger capacities), performance consistency out of the box is ok (and gets better if you can leave more free space on the drive) and you've got Samsung's firmware expertise supporting you along the way as well.
840 EVO | by Anand-Lal-Shimpi (Jul, 2013)

Windows 7 Boot-up Time

840 EVO
9.3 s
Intel 520
11.3 s
840 EVO 520 @ ssdreview.com
Crucial's 960GB M500 may just have the edge in terms of pricing, offering 'terabyte-class' drives for less than this hefty EVO SSD, but when it comes to performance Samsung has got it in spades.
840 EVO | by Tech Radar (Jul, 2013)

Avg. Power Consumption

840 EVO
2.29 Watts
Intel 520
2.66 Watts
840 EVO 520 @ ssdreview.com
The PCIe interface offers dramatically higher sequential performance, but does nothing for the random speeds - and this is arguably what really matters in terms of real-world SSD usage.
840 EVO | by Tech Radar (Jul, 2013)

4K Random Read Access Time

840 EVO
2.34 ms
Intel 520
3.08 ms
840 EVO 520 @ ssdreview.com
The 120GB and 250GB drives on the other hand have only 3GB, which will get filled up a lot quicker.
840 EVO | by Tech Radar (Jul, 2013)

4K Random Write Access Time

840 EVO
0.78 ms
Intel 520
2.82 ms
840 EVO 520 @ ssdreview.com
The reason that placing still works though is because the EVO is using a new write acceleration algorithm, called TurboWrite, to achieve some of its beefier performance scores.
840 EVO | by Tech Radar (Jul, 2013)

Reviews Word on the street

840 EVO  vs Intel 520 

9.0
7.6
The RAPID mode is designed specifically to help boost random performance and uses spare CPU power and system memory capacity (up to 1GB) to act as another layer of cache.
840 EVO

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