SSDBoss Review Our evaluation of 840 Pro vs 840 EVO

read performance

How quickly data is read from the drive

840 Pro
9.4
840 EVO
9.5
4K Random Read, 4K Random Read Access Time and 512K Sequential Read

write performance

How quickly data is written to the drive

840 Pro
9.3
840 EVO
8.9
4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

840 Pro
10.0
840 EVO
9.8
Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy

Benchmarks

How well the drive performs on common benchmarks

840 Pro
8.3
840 EVO
8.4
PCMark Vantage and AS SSD Score

SSDBoss Score

read performance, write performance, real world benchmarks and Benchmarks

840 Pro
9.2
840 EVO
9.0

Winner
Samsung 840 Pro 

SSDBoss recommends the Samsung 840 Pro  based on its write performance and real world 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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Faster 4k random write 130.58 MB/s vs 106.65 MB/s More than 20% faster 4k random write
Faster windows 7 boot-up time 7.8 s vs 9.3 s More than 15% faster windows 7 boot-up time
Faster photoshop lens filter 56.1 s vs 56.6 s Almost the same
Lower avg. power consumption 2 Watts vs 2.29 Watts Around 15% lower avg. power consumption
Sibling view of Samsung 840 EVO

Reasons to consider the
Samsung 840 EVO

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Much higher capacity 1,000 GB vs 512 GB More than 95% higher capacity
Much larger cache 1,000 MB vs 256 MB Around 4x larger cache

Benchmarks Real world tests of 840 Pro vs EVO

4K Random Read

840 Pro
311.34 MB/s
840 EVO
318.8 MB/s
840 Pro 840 EVO @ ssdreview.com
Best SSD performance we've seen for less than $1 per GB.
840 Pro | by PCMag (May, 2013)

4K Random Write

840 Pro
130.58 MB/s
840 EVO
106.65 MB/s
840 Pro 840 EVO @ ssdreview.com
Our Steady State Performance Testing reveals that while Samsung has improved things considerably compared to the 830 Series, easily surpassing SandForce-based drives, the 840 Pro is unable to match OCZ's latest Vector SSD.
840 Pro | by techPowerUp!

Windows 7 Boot-up Time

840 Pro
7.8 s
840 EVO
9.3 s
840 Pro 840 EVO @ ssdreview.com
Clearly this is one of the fastest consumer SSDs you can buy right now in terms of raw speed with its only real peer being the OCZ Vector drive powered by the Indilinx Barefoot 3 controller.
840 Pro | by Legit Reviews (Jan, 2013)

Avg. Power Consumption

840 Pro
2 Watts
840 EVO
2.29 Watts
840 Pro 840 EVO @ ssdreview.com
The Pro version only has the power consumption listed as 0.15W which we have to assume is an average although clearly well above the TLC equipped 840 drive.
840 Pro | by Legit Reviews (Jan, 2013)

4K Random Read Access Time

840 Pro
1.91 ms
840 EVO
2.34 ms
840 Pro 840 EVO @ ssdreview.com
It also leverages 21nm MLC Toggle 2.0 NAND which carries a longer endurance rating and is faster than the TLC variant.
840 Pro | by Legit Reviews (Jan, 2013)

4K Random Write Access Time

840 Pro
0.8 ms
840 EVO
0.78 ms
840 Pro 840 EVO @ ssdreview.com
That explains why a few of the performance numbers are a tad disappointing.
840 Pro | by Tech Radar (Dec, 2012)

Reviews Word on the street

840 Pro  vs EVO 

8.0
9.0
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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