The Crucial MX300 2TB SSD Review
For this benchmark, HDTach was used. It shows the potential read speed which you are likely to experience with these hard drives. The long test was run to give a slightly more accurate picture. We don’t put much stock in Burst speed readings and thus we no longer included it. The most important number is the Average Speed number. This number will tell you what to expect from a given drive in normal, day to day operations. The higher the average the faster your entire system will seem.
For this benchmark HD Tune Pro was used. To run the write benchmark on a drive, you must first remove all partitions from that drive and then and only then will it allow you to run this test. Unlike some other benchmarking utilities the HD Tune Pro writes across the full area of the drive, thus it easily shows any weakness a drive may have.
As expected the read performance of this larger drive is all but undisguisable from that of any other SATA based solid state drive. That is to say it is excellent for its class but is being bottlenecked by the SATA AHCI interface.
The write performance on the other hand simply blew us away. Usually when dealing with SSDs that rely upon a pseudo-SLC write buffer there are three unique performance levels that create an almost ‘steps’ appearance. The SLC cache is the topmost step and as it is filled, it starts to rely upon the RAM buffer. This is due to the fact that it has to “cover” SLC write buffer as it is flushed to the TLC NAND. When this is done, the performance ‘steps down’ a notch, then as the RAM buffer is overloaded and the SLC buffer is overloaded the ‘true’ performance of the TLC NAND is shown.
The MX300 2TB on the other hand does not have three steps. It only has two. For the first approximate 900GB of write performance the RAM and SLC buffer can more than handle the load. Then as expected the performance dips down as the controller really starts to try and flush it while also keeping up with the incoming IO demands. However then instead of dipping down to a third level and staying there, the MX300 2050GB only occasionally and only momentarily dips down before going back up and staying up at the second performance level.
Yes this drive has so much RAM and such great interleaving that the SLC buffer will last for nearly a terabyte of constant writing and never really gets overloaded to the point of being useless – like it does on smaller TLC NAND drives.