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Samsung 840 Pro 256GB SSD Review

By: Chris Ramseyer | SSDs in Storage | Posted: Feb 14, 2013 7:56 am
TweakTown Rating: 94%Manufacturer: Samsung

HD Tune Pro


Version and / or Patch Used: 4.00

Developer Homepage:

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HD Tune is a Hard Disk utility which has the following functions:


Benchmark: measures the performance

Info: shows detailed information

Health: checks the health status by using SMART

Error Scan: scans the surface for errors

Temperature display


HD Tune Pro gives us accurate read, write and access time results and for the last couple of years has gained popularity amongst reviewers. It is now considered a must have application for storage device testing.





Both the 840 and 840 Pro do very well when reading sequential data at QD1. Vector limits QD1 reads to around 350MB/s, but when the commands are stacked, the performance increases to around 500MB/s. The 840 and 840 Pro also increase performance when the queue depth is increased. We'll see higher NCQ writes in the CrystalDiskMark tests later in this review.




Here we see one of the large differences between the base 840 and the 840 Pro - write performance. The 840 Pro with MLC NAND writes much faster than the 840 with TLC. In this test using 64K size data, Vector enters 'storage mode' and slows halfway through the test. The low minimum speed isn't something you'll hit under normal use, but it does show up in our testing.


HD Tach - Sequential Write Performance After Random Writes




The Samsung 840 Pro still writes sequential data at an average speed of 395MB/s after being hit with a large amount of random writes. This is much better than the 840 Pro 128GB and 840 250GB.

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