SSD has become a standard component of the computer. It has experienced a series of 2.5-inch SATA, mSATA, PCI-E in-line and other stages. The smaller and more powerful M.2 interface SSD supporting NVME has become Absolute mainstream.
With the rapid advancement of technology, the speed of iterative update of major brand products is getting faster and faster, resulting in a variety of models with different performance.
So what is the current performance level of the M.2 NVME SSDs on the market? We have compiled their information into two tables, which are concentrated in the mainstream models of 240-256GB and 480-512GB. .
How much capacity is enough to buy?
Compared with the past two years, the whole machine, especially the notebook, has become popular. It only asks for the '128GB capacity SSD that can't be used'.
240-256GB products can not only provide a high-speed storage space for a system and daily software, but also a relatively large capacity to install several small games to increase the loading speed.
Daily use does not have to be entangled for one or two GB capacity. Significantly reduce the anxiety of 'insufficient disk capacity'. So if you plan to buy SSD, then the 240-256GB product should be the entry barrier for a good experience.
480-512GB:
How do you see so much data?
Solid-state drive manufacturers generally like to promote sequential read and write performance. The more and more exaggerated numbers reflect the improvement of SSD performance. The horizontal comparison is also the larger the number, the better the performance. But such digital comparison does not correctly represent The actual gap between products.
In fact, in our daily use, in addition to game map package loading, video file copy and other scenes, seldom use large amounts of continuous reading and writing.
On the contrary, in daily use, the system spends most of the time doing small and small file read and write calls, so for most consumers, the random read and write performance of SSD is more important for SSD as a system disk.
Stronger random read and write performance means faster system response and software open speed, so random read and write as much as possible should be used as the primary reference.
Is it necessary to entangle MLC or TLC?
Old tune, talking about the problem that SSD can't do is particle selection. First, let's take a look at the difference between SLC, MLC and TLC. Of course, there is also a rookie coming soon, which is QLC.
SLC and MLC are abbreviations for Single-Level Cell and Multi-Level Cell, and so on. TLC and QLC are abbreviations for three-layer and four-layer units.
In principle, SLC only stores 1 bit of data on one unit, while MLC stores 2 bits, TLC needs to store 3 bits, and QLC reaches 4 bits of data.
The more data stored on each unit, the more complex the structure, the higher the probability of error, the more corrective operations required, and the lower the theoretical performance. And because each storage unit is storing more data. Next, the access is more frequent, the wear is greater, and the corresponding life is lower.
However, performance issues can be improved with stronger performance mastering and algorithm optimization, and 3D NAND technology also greatly improves performance. In terms of lifetime, even 3D TLC, which claims to have a significant increase in lifetime, cannot be compared with MLC. But what if TLC is really not enough?
Take the 250GB Samsung 970EVO as an example. The warranty policy is 5 years or 150TBW, 5 years is 260 weeks, then an average of 577GB writes per week, an average of 82GB writes per day, which is equivalent to replacing hard drive data every three days. Once again, this life expectancy is basically not a concern for most ordinary consumers.
As for the performance of TLC, there is no need to repeat it. The TLC flagship data in the table at the beginning of this article proves itself.
Back to the tangled particle selection problem, MLC is certainly undeniable. In the case of close performance and sufficient life, 3D TLC products will undoubtedly have obvious cost performance advantages if the price is considered.
Warranty
Why is there no warranty for the Samsung SM, PM series SSD?
In fact, the SSD of the SM or PM series is Samsung's SSD products specially produced for OEM OEMs. These SSDs on the market come from the outflow of OEM channels.
Due to the number of OEM purchases, and generally these products do not contain VAT, the price is generally lower than the PRO and EVO with very close performance.
Since it is not a formal consumer product, the consumer-level quality assurance policy will not cover these products. However, the general store will provide a one-year shop warranty.
