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Samsung 840 EVO 128GB mSATA SSD Review

By: Chris Ramseyer | mSATA in Storage | Posted: Jan 8, 2014 3:00 pm
TweakTown Rating: 92%Manufacturer: Samsung

AIDA64 Random Access Time


Version and / or Patch Used: 1.60

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AIDA64 offers several different benchmarks for testing and optimizing your system, or network. The Random Access test is one of very few (if not the 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 only happens with controllers manufactured by JMicron and Toshiba.




As expected, the read latency was very good on the Samsung 840 EVO mSATA 120GB. The TLC flash still manages to produce Marvell level read latency, as shown here with the Plextor PX-M5M.




The write latency increases significantly once we get out of the Turbo Write area. This is an issue we've found on every low capacity Samsung SSD, going back to the 830.



What it really comes down to is this: For normal day to day stuff like surfing the web, reading your online email, face-twit and such, the 120GB model will perform great. When you start downloading Outlook in the morning, and have 40+ messages, transfer movies or music to your EVO 120GB, or do anything that gets outside of Turbo Write, you will notice the slowdown with the drive running on its own.




This is where RAPID Mode from the Magician software suite comes into play. If your system has 4GB of DRAM, RAPID will build a 1GB DRAM cache to give your storage system a larger buffer that is able to absorb the data, and feed it to the drive in steady doses. The result is a much smoother user experience.

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