DRAM, HBM and NAND: which memory is actually short
Key takeaways
- DRAM is fast working memory, NAND is long term storage, and HBM is DRAM stacked and packaged right beside an AI chip
- All three are made in the same factories, so demand for one tightens supply for the others
- Micron expects tight supply through 2028, so memory prices are unlikely to ease soon
When people say there is a memory shortage, they usually mean three different products at once. DRAM, HBM and NAND all store data, they sit in the same devices and they are built by the same handful of companies. They do very different jobs, though, and the difference explains why AI demand is hurting everyone's prices.
HBM vs DRAM explained
DRAM is the working memory in your computer. It holds whatever the processor is using right now, it is fast, and it forgets everything when the power goes off. The RAM in a laptop or desktop is DRAM.
HBM, or high bandwidth memory, is DRAM built differently. Chips are stacked on top of each other and packaged right next to an AI processor, which gives that processor a very wide, very fast connection to its data. That design is what makes it useful for training and running large models, and it is also why it is expensive. We cover the engineering in our explainer on what HBM4 is, and the older comparison in HBM vs GDDR vs DDR.
The catch is capacity. A maker can only produce so much memory, and a factory that turns out HBM for an AI accelerator is not turning out ordinary DDR5 for a PC. In plain terms, one chip type is eating the factory time of the other.
Where NAND fits
NAND flash is storage, not working memory. It is what sits inside an SSD or a phone, and it keeps your files with the power off. It is slower than DRAM but far cheaper per gigabyte.
NAND is not HBM, but it is caught in the same pressure. AI data centres need fast storage as well as fast memory, and the companies that make flash compete for the same capital and customers. When a supplier chooses where to put its next investment, the answer tends to follow the highest margin.
Why this matters for your next purchase
Micron has said it expects supply to stay tight through 2028, and that more than 75% of its 2027 output is already committed. You can read the numbers in our report on Micron selling most of 2027 early.
For a buyer, the practical read is that all three categories are exposed. If you are building a PC, a kit like the Corsair Vengeance RGB DDR5 32GB is a useful price benchmark, and you can check current pricing on Amazon. Do not assume that waiting a few months will bring the price down.
The part worth watching is whether new factory capacity appears for conventional DRAM and NAND, or whether the industry keeps chasing HBM margins. Until that changes, the cheap end of the memory market stays the awkward one.
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