SanDisk Ultra Plus SSD Review (256GB)


ATTO Disk Benchmark is perhaps one of the oldest benchmarks going and is definitely the main staple for manufacturer performance specifications. ATTO uses RAW or compressible data and, for our benchmarks, we use a set length of 256mb and test both the read and write performance of various transfer sizes ranging from 0.5 to 8192kb. Manufacturers prefer this method of testing as it deals with raw (compressible) data rather than random (includes incompressible data) which, although more realistic, results in lower performance results.

SanDisk Ultra ATTO

Listed specifications for the Ultra Plus are 530MB/s read and 445MB/s write and ATTO did provide high transfer speeds just under.  It was also encouraging to see high SATA 3 speeds at the 4k level, however, the better drives we have tested show a gradual and consistent climb in transfer speeds.


Crystal Disk Benchmark is used to measure read and write performance through sampling of highly compressible data (oFill/1Fill), or random data which is, for the most part, incompressible. In the Ultra Plus, we have provided the result with random data samples as both results were extremely similar.

SanDisk Ultra Crystal Disk Mark

The low 4k write result of Crystal DiskMark is very encouraging, however, we might have hoped for a score above 100MB/s (that elusive plateau) with nCache.  Other than that, these are favorable results.


Up until recently, AS SSD was the only benchmark created specifically for SSD testing and it uses incompressible data.  AS SSD, for the most part, gives us the worst case scenario in SSD transfer speeds because of its use of incompressible data and many enthusiasts like to AS SSD for their needs. Transfer speeds are displayed on the left with IOPS results on the right.

SanDisk Ultra Plus AS SSDSanDisk Ultra Plus AS SSD IOPSAS SSD results are a bit lower than CDM and we get a first look at IOPS which are almost right on par with listed specs.  We thought we might throw in the AS SSD Copy Bench as it is a ‘true to life’ example of transfer speeds as we might typically see them.

SanDisk Ultra Plus AS SSD Copy Benchmark

The Copy Benchmark simply transfers an .ISO, Program and Game from one spot on the SSD to another and monitors the highest transfer speeds reached and time to complete the transfer.  These are excellent results where all three transfers were completed very quickly and reached SATA 3 speeds.


  1. blank

    So so performance, but fantastic price. Can’t wait to see what pricing on this SSD looks like in a couple months especially with SanDisk controlling the fab. Great review as always, Les!

  2. blank

    Mine is a good example i guess 🙂
    Purchased in 2013, heavy user, SanDisk Ultra Plus SSD is 4 years old now.
    Run heavily modded Fallout 4 and Skyrim as well as Photoshop and 3DSmax.
    SSD dashboard says 93% life left, thats 50+ years reliability @ heavy use.
    Performance has decreased but working perfectly, no errors ever.

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