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Comparison A-Data Ultimate SU650 ASU650SS-120GT-C 120 GB vs A-Data Ultimate SU700 ASU700SS-120GT-C 120 GB

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A-Data Ultimate SU650 ASU650SS-120GT-C 120 GB
A-Data Ultimate SU700 ASU700SS-120GT-C 120 GB
A-Data Ultimate SU650 ASU650SS-120GT-C 120 GBA-Data Ultimate SU700 ASU700SS-120GT-C 120 GB
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Main
High reading speed. Direct write to TLC memory.
Placementinternalinternal
Size120 GB120 GB
Form factor2.5"2.5"
InterfaceSATA 3SATA 3
Technical specs
ControllerSilicon Motion SM2258XT
Memory type3D TLC NAND3D TLC NAND
Write speed320 MB/s320 MB/s
Read speed520 MB/s560 MB/s
Shockproof1500 G1500 G
MTBF2 m h2 m h
Write IOPS75 K70 K
Read IOPS20 K30 K
TBW70 TB70 TB
DWPD0.55 times/day0.55 times/day
Manufacturer's warranty3 years3 years
General
TRIM
Size100x70x10 mm70x100x7 mm
Weight48 g48 g
Added to E-Catalogjanuary 2018june 2017

Controller

Model of the controller installed in the SSD.

The controller is a control circuit, which, in fact, ensures the exchange of information between the memory cells and the computer to which the drive is connected. The capabilities of a particular SSD module (in particular, read and write speed) largely depend on this particular scheme. Knowing the controller model, you can find detailed data on it and evaluate the capabilities of the drive. For simple everyday use, this information is usually not needed, but for professionals and enthusiasts (modders, overclockers) it can come in handy.

Nowadays, high-end controllers are produced mainly under such brands: InnoGrit, Maxio, Phison, Realtek, Silicon Motion, Samsung.

Read speed

The highest data exchange rate with a computer (or other external device) that the drive can provide in read mode; in other words — the highest speed of information output from the drive to an external device. This speed is limited both by the connection interface (see "Connector"), and by the characteristics of the device of the SSD itself. Its values can vary from 100 – 500 MB / s in the slowest models to 3 Gb / s and higher in the most advanced ones.

Write IOPS

The IOPS provided by the drive in write mode.

The term IOPS refers to the highest number of I / O operations that an SSD module can perform per second, in this case, when writing data. By this indicator, the speed of the drive is often evaluated; however, this is not always true. Firstly, the IOPS values of different manufacturers can be measured in different ways — by the maximum value, by average, by random write, by sequential write, etc. Secondly, the benefits of high IOPS become noticeable only with some specific operations — in in particular, the simultaneous copying of numerous files. In addition, in fact, the speed of the drive may be limited by the system to which it is connected. In light of all this, it is generally acceptable to compare different SSD modules by IOPS, but the real difference in performance is likely not to be as noticeable as the difference in numbers.

As for specific values, for the write mode with IOPS up to 50K is considered relatively modest, 50 – 100K — medium, more than 100K — high.

Read IOPS

The IOPS provided by the drive in read mode.

The term IOPS refers to the maximum number of I / O operations that an SSD module can perform per second, in this case, when reading data from it. By this indicator, the speed of the drive is often evaluated; however, this is not always true. Firstly, the IOPS values of different manufacturers can be measured in different ways — by the maximum value, by the average, etc. Secondly, the advantages of high IOPS become noticeable only with some specific operations — in particular, when copying numerous files at the same time. In addition, in fact, the speed of the drive may be limited by the system to which it is connected. In light of all this, it is generally acceptable to compare different SSD modules by IOPS, but the real difference in performance is likely not to be as noticeable as the difference in numbers.

For modern SSDs in read mode, an IOPS value of less than 50K is considered a very limited indicator, in most models this parameter lies in the range of 50 – 100K, but there are also higher numbers.
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