Buying storage devices can be perplexing at times. With the same capacity and interface, one would expect similar speeds, yet the price differences can be shocking. Understanding these variations feels like solving a puzzle, especially when comparing SSDs and their myriad parameters.
Today, let’s discuss why seemingly similar SSDs can have price differences of several hundred yuan, and what pitfalls to avoid when purchasing.
First, a key factor determining SSD speed and lifespan is its controller. This component acts as the SSD’s brain, managing internal tasks neglected by the operating system, such as garbage collection, wear leveling, and error correction. A good controller ensures your SSD runs fast and reliably for years, while a lesser one might fail within two or three years.
Thus, although reputable brands charge more for their SSDs, their controllers are generally reliable. Opting for a cheaper, lesser-known brand can be risky regarding controller quality.
Another price influencer is the DRAM cache within the SSD. Think of it as the SSD’s “boost engine,” helping process temporary data for faster performance. Without this cache, an SSD’s speed can feel severely restricted, especially when running multiple applications.
Budget SSDs might lack this cache entirely, while high-end enterprise SSDs come equipped with larger, faster caches. Though product pages rarely provide detailed information, review sites like Tom’s Hardware conduct in-depth analyses, noting features like the 2GB LPDDR4 cache in the Samsung 990 Pro, which significantly enhances speed.
Next, consider NAND flash memory, the actual data storage medium in an SSD. While the external appearance may not reveal much, the quality of internal flash directly affects performance and longevity. More expensive SSDs utilize superior quality flash, resulting in better durability and a lower likelihood of failure.
You may encounter the TBW parameter in product specifications, indicating the total data volume the SSD can write before failing. For instance, the Samsung 990 Pro has a TBW of 600TB, meaning you can use it confidently up to that limit. In contrast, cheaper generic SSDs may reach their limits much faster, compromising lifespan.
Overall, don’t be misled by surface-level specifications. The controller, DRAM cache, and NAND flash are the true performance and longevity determinants. Choosing a reputable brand for your primary SSD is a safe bet.
If you’re still unsure about which SSD brand to choose, the simplest approach is to look at random read/write speeds, or IOPS. However, remember that these figures only scratch the surface and don’t fully represent the SSD’s true performance.
Is this clarification on choosing an SSD helpful?
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