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Samsung 840 EVO 750GB SSD Review (Page 6)

By Chris Ramseyer on Jul 25, 2013 at 11:15 am CDT - 1 min, 54 secs reading time for this page
Rating: 95%Manufacturer: Samsung

AIDA64 Random Access Time

Version and / or Patch Used: 1.60

Developer Homepage:

Product Homepage:

AIDA64 offers several different benchmarks for testing and optimizing your system or network. The Random Access test is one of very few if not only that will measure hard drives random access times in hundredths of milliseconds as oppose to tens of milliseconds.

Drives with only one or two tests displayed in the write test mean that they have failed the test and their Maximum and possibly their Average Scores were very high after the cache fills. This usually happens only with controllers manufactured by Jmicron.

Samsung 840 EVO 750GB SSD Review 56 |

The Samsung 840 EVO 750GB and 250GB both share the same read data access times of .11 in this test.

Samsung 840 EVO 750GB SSD Review 57 |

We think when Samsung moved to their new 19nm process for TLC, they also doubled the capacity of the die to 128Gbit. We're seeing an increase in write latency with the new EVO, just like we did with M500 when Micron moved to new 128Gbit dies.

Samsung 840 EVO 750GB SSD Review 99 |

Here we see the test with RAPID enabled, so we can walk though some of this. The first thing to understand is that in a consumer / client environment, you will never write the entire capacity of the SSD all at one time. Several reviews will be published today using IOmeter where reviewers are looking for steady state performance either in MB/s or IOPS. Those tests have zero validity in consumer SSD testing simply because you will never write 500GB of data to a 250GB SSD as fast as you can with a client workload.

With that said, let's look at the graph. At the beginning you see RAPID, then the SLC layer and then TLC latency. After the third step up from the left, the drive starts garbage collection, and the latency increases. Further to the right, it appears that the 840 EVO starts a more aggressive GC scheme and that increases latency even further. By the time that happens, we've already wrote 325GB of data to the drive as fast as we could. I'm not going to say that's impossible, but in order to do it, you have to transfer six and a half Blu-ray ISOs to the drive back-to-back.

Last updated: Nov 15, 2019 at 01:16 pm CST

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ABOUT THE AUTHOR - Chris Ramseyer

Chris Ramseyer started his career as a LAN Party organizer in Midwest USA. After working with several computer companies he was asked to join the team at The Adrenaline Vault by fellow Midwest LAN Party legend Sean Aikins. After a series of shake ups at AVault, Chris eventually took over as Editor-in-Chief before leaving to start Real World Entertainment. Look for Chris to bring his unique methods of testing Hard Disk Drives, Solid State Drives as well as RAID controller and NAS boxes to TweakTown as he looks to provide an accurate test bed to make your purchasing decisions easier.

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