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
9.5
840 EVO
9.1
4K Random Write, 4K Random Write Access Time and 512K Sequential Write

real world benchmarks

How well the drive performs common tasks

840 Pro
9.8
840 EVO
9.6
Windows 7 Boot-up Time, Photoshop Lens Filter and AS SSD ISO Copy

Benchmarks

How well the drive performs on common benchmarks

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

No winner declared

Too close to call

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
Lower avg. power consumption 2 Watts vs 2.29 Watts Around 15% lower avg. power consumption
Slightly lower 4k random write access time 1.91 ms vs 2.34 ms Around 20% lower 4k random write access time
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
Significantly more capacity per dollar 2.27 GB/$ vs 1.49 GB/$ Around 55% more capacity per dollar

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

Comments

Showing 6 comments.
Thanks for your reply Benjamin. There has been literally hundreds of thousands of reviews all over the internet that how moving onto SSD has increased the system stability and performance and what I'm experiencing is no different than that. I'm not sure why you say like that maybe you should test it yourself to notice the difference. Applications opens much faster and having the paging file in SSD simply extends the performance when I open 50+ Tabs in Chrome/Firefox as well as when I work in photoshop. It can hardly happen even in dreams if it was an mechanical drive.
The difference you're experiencing (other than the boot time) is likely more related to the fresh install of Windows, rather than the difference in hard drive design.
I've been hearing how replacing the old mechanical hard drive with an SSD would increase performance of any PC. I wasn't sure how much of an improvement it'd be since I wouldn't be updating the processor. After I put in the SSD it was a whole new world. The laptop booted up in seconds instead of minutes. Applications opened faster and everything was more responsive. Until now I never realized how much the mechanical hard drive bottlenecked the laptop's performance (as opposed to the processor). I don't think adding more RAM can increase performance this much. I bought the 250GB for just $130 from here http://amzn.to/1ric5NU and still have plenty of room to install more softwares.The difference between the mechanical drive and SSD is day and night!
As can been seen in the benchmark results, there are only minor differences in day to day performance. However, there is a POTENTIAL difference in longevity due to the different memory types used. 840 EVO uses TLC (3 bits/cell) memory while 840 PRO uses MLC (2 bits/cell) memory. Less bits per cell results in less electronic wear and tear and longer life. A long term test has shown 840 EVO memory degrading after many, many, many terabytes of data being written continuously - with no degradation of 840 PRO so far (test is continuing over many months). However, use of overprovisioning allows data to be automatically moved to 'fresh' areas of the drive and there has been no corruption of data or crash yet. 840 EVO had what was considered to be equivalent to 10 years of use by the time of any significant impact (and should continue to be functional for the equivalent of many more years with the continued use of the overprovision space). There is more likely to be a controller failure or other fault long before the memory of either drive actually 'wears out'. IF you want the greatest peace of mind for longevity/data integrity - spring for the 840 PRO... HOWEVER, the 840 EVO provides a reasonable expected lifespan at a significant cost reduction. Pick the characteristic that's more important to you - Robustness (840 PRO) or Price (840 EVO).
Warranty. 5 years vs. 3 for peace of mind I guess. Not sure if it's really something to worry about now. I just remember people getting stung with OCZ Vertex 2 SSD's.
Seeing these benchmarks (here and on other sites), there isn't very much difference in performance between the two models. The differences are minuscule with the exception in the 4K Random Write test. However, the prices are greatly different. As a pro, Is it really worth it then? I'm thinking of getting a 500GB+ model.
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