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Samsung 840 EVO 250GB SSD Review (Page 4)

By: Chris Ramseyer from Jul 25, 2013 @ 7:44 CDT
TweakTown Rating: 95%Manufacturer: Samsung

Desktop Test System


Lenovo W530 - Mobile Workstation

We use two systems for SSD testing. The desktop runs a majority of the tests and the Lenovo W530 runs the notebook power tests as well as the real-world file transfer benchmark.

ATTO Baseline Performance

Version and / or Patch Used: 2.34

ATTO is a timeless benchmark used to provide manufactures with data used market storage products.


Meet the Samsung 840 EVO 250GB with measured sequential read performance of just over 550MB/s and sequential write performance of nearly 540MB/s.


Now meet the Samsung 840 EVO 250GB with RAPID mode enabled. There are two things to know when looking at this image. The first is the scale at the bottom has changed, now to 4294MB/s. The second thing to know is that ATTO is an old school benchmark, developed well before 64-bit computing. ATTO uses 32-bit integers. Since ATTO uses bytes to display the performance on the right side, any number larger than the largest 32-bit number [em]wraps[/em] around and rests. The writes wrap around at the 128KB transfer size and the reads wrap at 2048KB.

This is the first time we've seen this occur on anything outside of my enterprise RAID storage arrays used to set world records in PCMark. EVO isn't just an SSD product though and without RAPID, this wouldn't happen. With RAPID you have up to 1GB of system RAM working in tandem with the SSD to cache data to and from the drive.

Things are about to get interesting.

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