DRAM: what it means.
A DRAM cell uses stored electrical charge to represent information. Because that charge diminishes, the memory requires periodic refresh. Removing power loses the stored information, making DRAM volatile memory. (Samsung: DRAM and SRAM)
SRAM avoids periodic refresh while powered by using a different cell structure. HBM, by contrast, is a stacked DRAM architecture. These terms classify different aspects of memory rather than describing three interchangeable parts. (Samsung: DRAM and SRAM)
Put the definition to work.
HBM is a DRAM architecture, not a replacement term for all memory. Identify the interface and organization as well as the capacity when comparing memory devices. (Samsung: DRAM and SRAM)
Questions to ask next.
Use these questions as a reading checklist, not as a device-selection recommendation. Exact manufacturer documentation takes priority over a general definition.
- Memory architecture and interface
- Capacity and transfer requirements
- Refresh, power and controller requirements
For the broader explanation, explore memory and bandwidth. This page defines the term; the companion guide connects it to the rest of the system.
Common DRAM questions.
Is DRAM a form of permanent storage?
No. DRAM is volatile working memory. Systems that need information retained across power loss require an appropriate retention or storage arrangement. (Samsung: DRAM and SRAM)