Do SSDs With DRAM Cache Matter and How to Identify Them

SSDs have revolutionized the storage industry with their faster boot times, quick app launches, and lightning-fast transfer speeds. However, not all SSDs are created equal. Some SSDs come with a feature called DRAM cache, which makes them technically superior to those without it. But what exactly is DRAM in an SSD? Why is it better to have it in your SSD? And most importantly, how can you identify SSDs with DRAM? In this article, we will explore everything you need to know about SSDs with and without DRAM and how to tell them apart.

What Is DRAM in an SSD

SSDs, unlike traditional hard drives, don't have any moving parts. Instead, they use NAND flash chips to store data. These chips store data and are accessed by the CPU as per its instructions. SSDs also use Data map tables to track the location of the stored data in the NAND flash.

In SSDs without DRAM, these tables are stored in the NAND itself. However, if an SSD has DRAM, it stores these tables in the DRAM cache. This improves data management, speeds up access times, and enhances the overall performance and longevity of the SSD. It's important to note that the presence of DRAM is not limited to a specific form factor of SSD. Both 2.5 inch, M.2, and NVME SSDs can come with or without DRAM.

Tables in SSD without DRAM

Tables in SSD with DRAM

Advantages of SSDs With DRAM

Let's explore some of the benefits of using SSDs with DRAM cache.

Speed

SSDs with DRAM are significantly faster than those without it in almost every aspect. With a dedicated DRAM chip, the CPU doesn't need to access the slower NAND flash for mapping tables, resulting in faster data retrieval. The DRAM cache provides quick access to the location of stored data, leading to improved random read and write speeds. Everyday tasks like web browsing and background operating system tasks heavily rely on random read and write speeds. SSDs without DRAM may cause occasional stuttering due to the delay in accessing data map tables.

Longevity

The absence of DRAM in an SSD puts additional strain on the NAND flash, as it is constantly used for data map lookups. As a result, SSDs without DRAM have a lower lifespan compared to their DRAM-equipped counterparts. Manufacturers also tend to offer shorter warranty periods for DRAM-less SSDs due to the higher probability of failure.

Applications of DRAM-Less SSDs

There is only one situation where you might consider using an SSD without DRAM: when cost is the primary concern.

Cost

DRAM-less SSDs are generally cheaper compared to SSDs with DRAM. While they may be slower, they still outperform traditional mechanical hard drives by a wide margin. Upgrading from a hard drive to a DRAM-less SSD can significantly boost your PC's performance. Additionally, due to shortages in production and availability of DRAM chips, DRAM-less SSDs are often more readily available for purchase.

What About HMB-Enabled DRAM-Less SSDs

Some newer DRAM-less SSDs come with a feature called Host Memory Buffer (HMB). HMB-enabled SSDs borrow system memory to perform the tasks typically handled by a dedicated DRAM chip. While these SSDs are faster than ordinary DRAM-less SSDs, they still don't match the performance of SSDs with dedicated DRAM. Furthermore, using system RAM for caching purposes may reduce the available memory for other tasks, potentially causing slowdowns. In conclusion, SSDs with DRAM cache remain the superior choice compared to any variant of DRAM-less SSDs.

HMB enabled DRAM-less SSD

Identifying SSDs With DRAM From DRAM-Less SSDs

Identifying whether an SSD has DRAM or not can be challenging, as most manufacturers do not explicitly mention it in the product specifications. However, there are curated online databases that provide information about the presence of DRAM in various SSD models.

One such database is maintained by Johnylucky.org, which keeps a vast record of SSD information, including whether a particular model has DRAM or not. Another useful resource is a constantly updated spreadsheet created by NewMaxx, which also confirms the presence or absence of DRAM in SSDs.

If you are comfortable opening an SSD, you can physically check if it has a DRAM chip onboard. However, this should only be attempted by experienced individuals, as mishandling the SSD can cause damage.

What's Inside Your SSD

SSDs are more complex than one might think. The presence of DRAM cache can significantly impact the performance and longevity of an SSD. It would be helpful if SSD manufacturers were more transparent about this feature and clearly mentioned it on the product packaging. Savvy users would certainly appreciate such information. In the domain of data drives, you might also be interested in learning how to differentiate between SMR and CMR hard drives.

Remember, when choosing an SSD, it's essential to consider your specific needs and budget. If speed and longevity are crucial factors for you, opting for an SSD with DRAM cache is highly recommended.