Average Bench: 78.8% (205th of 853)

Based on 27,626 user benchmarks.  Models: Samsung SSD 840 EVO 120GB, Samsung SSD 840 EVO 1, Samsung SSD 840 EVO 120G, Samsung SSD 840 EVO

The 120GB Evo, like its 250GB sibling, features a second level Turbowrite cache (TWC). This 3GB block of high speed SLC memory allows the Evo to write data at 370 MB/s, nearly double its normal rate. When the TWC is full write speeds drop by around 50% but since consumers generally write less than 3GB in a typical write operation, the performance drop will rarely be noticed. On the other hand, in a server environment this sort of performance degradation would be unacceptable. Comparing the 120GB and 250GB Evos shows that they have similar performance profiles. The performance equivalence between the different capacities, coupled with the fact that their prices are almost linear, implies that both capacities represent roughly the same value for money. Within its TWC, the 120GB Evo is capable of chart topping burst IO rates and it sits squarely amongst the best performing 120GB drives. [Aug '14 SSDrivePro]


Good average bench

The Samsung 840 Evo 120GB averaged 21.1% lower than the peak scores attained by the group leaders. This is an excellent result which ranks the Samsung 840 Evo 120GB near the top of the comparison list.


Avg. 4K Random Read Speed 36.8MB/s
Avg. Sequential Read Speed 472MB/s

Above average consistency

The range of scores (95th - 5th percentile) for the Samsung 840 Evo 120GB is 39.3%. This is a relatively wide range which indicates that the Samsung 840 Evo 120GB performs inconsistently under varying real world conditions.


Avg. 4K-64Thread Mixed IO Speed 43.9MB/s
Avg. 4K-64Thread Write Speed 155MB/s

Average Bench

(Based on 27,626 samples)
Min Avg Max
363 Read 472 501
230 Write 313 352
186 Mixed 307 343
80.6% 364 MB/s
Min Avg Max
23.8 4K Read 36.8 45.6
29.2 4K Write 59.2 83.6
12.1 4K Mixed 19.6 24.7
112% 38.6 MB/s
Min Avg Max
32 DQ Read 204 365
47.8 DQ Write 155 240
14.6 DQ Mixed 43.9 68.2
69.7% 135 MB/s
User Benchmarks Bench Sequential Random 4k Deep queue 4k
The fastest SSD (mainstream) averages a speed of 100%
56GB free
Firmware: EXT0BB6Q Max speed: SATA 3.0 600 MB/s
Read 476
Write 336
Mixed 331
84% 381 MB/s
4K Read 42.7
4K Write 71.3
4K Mixed 24.2
133% 46.1 MB/s
DQ Read 343
DQ Write 222
DQ Mixed 68.5
109% 211 MB/s
110GB free
Firmware: EXT0 Max speed: SATA 3.0 600 MB/s
Read 508
Write 319
Mixed 338
86% 388 MB/s
4K Read 42.9
4K Write 75.7
4K Mixed 14.1
123% 44.2 MB/s
DQ Read 253
DQ Write 75.9
DQ Mixed 31.6
58% 120 MB/s
27GB free
Firmware: EXT0BB6Q Max speed: SATA 3.0 600 MB/s
Read 483
Write 339
Mixed 336
86% 386 MB/s
4K Read 34.7
4K Write 71.8
4K Mixed 18.1
114% 41.5 MB/s
DQ Read 35.2
DQ Write 228
DQ Mixed 17.7
47% 93.6 MB/s
30GB free
Firmware: EXT0BB0Q Max speed: SATA 3.0 600 MB/s
Read 481
Write 280
Mixed 299
78% 353 MB/s
4K Read 34.3
4K Write 43.4
4K Mixed 16.6
96% 31.4 MB/s
DQ Read 37.6
DQ Write 135
DQ Mixed 16.3
33% 62.9 MB/s
29GB free
Firmware: EXT0BB0Q Max speed: SATA 3.0 600 MB/s
Read 482
Write 280
Mixed 305
78% 356 MB/s
4K Read 35
4K Write 45.3
4K Mixed 16.7
98% 32.3 MB/s
DQ Read 38.9
DQ Write 51.7
DQ Mixed 51.2
37% 47.3 MB/s
27,626 MORE »

 Market Share (See Leaders)

The number of benchmark samples for this model as a percentage of all 3,281,939 SSDs tested.


AmazonUS $129.1622 mins ago.
EbayUS $150.0043 mins ago.
OutletPCUS $182.845 hrs ago.
Send price feedback
Typical 840 Evo 120GB Builds (Compare 4,283 builds) See popular component choices, score breakdowns and rankings.
Gaming 47%
Desktop 65%
Battle cruiser
Workstation 39%
Jet ski

Motherboard: MSI Z87-G45 GAMING (MS-7821) - $242

EDIT WITH CUSTOM PC BUILDER Value: 60% - Good Total price: $962

Popular 840 Evo 120GB compatible motherboards:

How Fast Is Your SSD? (Bench your build) Size up your PC in less than a minute.

Welcome to our freeware PC speed test tool. UserBenchmark will test your PC and compare the results to other users with the same components. You can quickly size up your PC, identify hardware problems and explore the best upgrades.

UserBenchmark of the month

How it works

  • - Download and run UserBenchMark (UBM).
  • - CPU tests include: integer, floating and string.
  • - GPU tests include: six 3D game simulations.
  • - Drive tests include: read, write and mixed IO.
  • - Checks include: 4k Align, NCQ, TRIM, SATA, USB & S.M.A.R.T.
  • - RAM tests include: single/multi core bandwidth and latency.
  • - Reports are generated and presented on userbenchmark.com.
  • - Identify the strongest components in your PC.
  • - See speed test results from other users.
  • - Compare your components to the highest voted in class.
  • - Find the best upgrades.
  • - Share your opinion by voting.
Solid State Drive Rankings (Price vs Performance) July 2017 SSD Rankings.

Welcome to our consumer SSD comparison. We calculate effective speed based on real world performance then adjust by cost per GB to yield a value for money rating. Calculated values don't always tell the whole picture so we check them against thousands of individual user ratings. The customizable table below combines these factors and more to bring you the definitive list of top SSDs. Share your opinion by voting. [SSDrivePro]


Controller: Samsung 3 Core MEX. Memory: Samsung 19nm Toggle Mode TLC.

Experience a brand new, faster performance...

Added 3 years ago.

Poor (edit your comment) Add link

1 month ago.

Suffers from severe performance degradation.


30 days ago.


Good for general purpose use - best compromise between Price and performance. I have bought over 20 of these to retrofit into Laptops and desktop pc's to give a performance boost especially with a clean Windows 8.1 install. Makes a cheap Celeron Laptop fly like a new core i5 laptop with a standard electro-mechanical Hdd. PC World will not sell computers with SSD's in because if people savvy the huge performance boot you get with an SSD they will just buy a cheap sub £200 laptop and clone the disk to an SSD. Dell hike their prices to fit a 250GB SSD when you buy a new PC by £350 - WHAT A RIP OFF, No wonder they are going out of business. The 250GB and 500GB Samsung SSD's are equally good - recommended in fact. I have bought all of these in some quantity.—Oct '14


10 months ago.

Price vs Performance that drive is perfect


26 days ago.

best performance for this price

Above average

2 years ago.


2 months ago.

Super Fast and Price is exelent


2 months ago.

good speed 0 fails.


1 month ago.

i love this ssd, still fast on my old laptop with SATA 2.


2 months ago.

Best ssd


11 months ago.

Works really great. I've had it for 3 months already and had no troubles with it. It's fast and cheap. My 4 year old HP DV7-3180us feels like new with it.


13 months ago.

Best value ever!


2 years ago.

Low price , higher access , more faster !


3 years ago.

This SSD is perfect.


2 years ago.

awesome ssd

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853 Drives (Compared) Thousands of user benchmarks compiled into one comparison list.

See how consistently different SSDs perform with varying real world conditions. The charts also illustrate overall performance, popularity and rank.

 Frequently Asked Questions

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