Quick Links
When buying an SSD, storage capacity and read/write speeds are normally the top priorities. However, there is one hidden stat that is often overlooked: The SSD DRAM cache. But what is this mysterious stat, and how does it affect data transfer rates?
What Is SSD DRAM Cache?
SSD DRAM caches, or DRAM (Dynamic Random Access Memory) buffers, are high-speed memory buffers that act as a conduit between SSDs (Solid State Drives) and PCs. Thisvolatile memorycan quickly store and retrieve data but loses its content once the power is off. It’s different from a long-term storage device such as an SSD, which usesNAND Flash technology.
For a better understanding, let’s break down each component:
How SSD DRAM Cache Affects Data Transfer Rates
Now that we know what an SSD DRAM cache is, let’s see how itaffects data transfers. When accessing data, the processor sends a request to the SSD. The SSD then retrieves the data from its NAND Flash memory and temporarily stores it in the DRAM cache. From there, the DRAM buffer receives the data and passes it on to the processor. This process is much faster than retrieving data directly from SSD NAND Flash memory.
To better understand, think of a busy highway with additional lanes. The highway is your SSD, while the extra lanes represent your DRAM cache. When there is heavy traffic (high data transfer rate), the additional lanes (DRAM cache) allow for faster movement of cars (data) compared to a single lane (directly retrieved from NAND Flash memory).
Without an SSD DRAM cache, the processor would have to wait for the NAND Flash memory to retrieve and transfer data. This delay is known as latency, and it slows down data transfers. Additionally, DRAM cache size significantly affects data transfer rates. A larger DRAM cache can store and retrieve more data temporarily, reducing the need for slower NAND Flash memory.
How To Check SSD DRAM Cache Before Buying
So far, we’ve discussed the SSD DRAM cache and its impact on data transfer rates. But how can you tell if your SSD has one? Here are some ways to find out:
DRAM is an excellent way to get more power from your SSD and speed up transfer times. So, if you regularly share big files, you should strongly consider purchasing an SSD with a good DRAM cache.
