In this article, we will look at the differences between DRAM (Dynamic Random Access Memory) and HMB (Host Memory Buffer), which directly affect SSD performance.
What is DRAM?
DRAM, or Dynamic Random Access Memory, is a type of temporary memory. This type of memory allows the processor to quickly access the data it needs. In SSDs, the presence of DRAM enables data to be processed very quickly, and once your task is completed, the necessary data begins to be permanently written to the NAND chips in the background.
Advantages of Having DRAM in SSDs:
Provides very fast data access since it is located directly on the SSD.
Maintains high performance during large-capacity and complex file transfers.
Delivers high performance in demanding processes such as rendering.
Disadvantages:
The presence of a physical DRAM module on the SSD significantly increases its price.
SSDs with a DRAM module have relatively higher power consumption and generate more heat.
What is HMB?
HMB, or Host Memory Buffer, is a technology mostly used in SSDs without DRAM. It allows the SSD to use a small portion of the system’s main memory (RAM) as a buffer. It is especially preferred in DRAM-less NVMe SSDs to reduce costs and improve performance. SSDs with HMB technology typically use a very small amount of RAM, such as 64 MB.
Advantages:
Lowers the cost of the SSD since it does not contain a physical DRAM module.
Creates additional buffer memory by using the system’s RAM.
Provides higher performance when handling small-sized complex file transfers and similar tasks.
Increases IOPS performance, delivering performance improvements in all scenarios.
If you are building a system for gaming or similar purposes, its performance will be more than sufficient.
Disadvantages:
Performance is lower compared to SSDs with DRAM.
Since the cache capacity is limited, it may not be able to maintain performance in demanding tasks.
Conclusion
SSDs with DRAM are the best option for those who want maximum performance and especially for users who use their computers for work beyond gaming. On the other hand, SSDs with HMB technology are a good choice for those seeking price-to-performance balance in everyday use and gaming systems. If you have to buy a DRAM-less SSD, keep in mind that even budget SSDs are more than sufficient nowadays, so there’s no need to worry too much about it.