DDR4 RAM Prices: Cost per GB by Capacity

DDR4 desktop memory: what this page tracks

DDR4 is the previous desktop memory generation, and the reason this page exists in 2026 is that a very large installed base of boards still takes nothing else. This page tracks 71 in-stock DDR4 desktop kits on Amazon US, priced per gigabyte of total kit capacity and computed when you load the page. The reason it needs its own treatment rather than a footnote on the DDR5 page is that DDR4's shortage story is different: the generation is being made in shrinking volume while demand from existing machines does not shrink with it.

That story has been widely repeated and rarely measured, which is the gap this page is here to fill for the consumer side. The claim we hear most is that DDR4 has become as expensive per gigabyte as DDR5; whether that is true is a question with a capacity in it, because comparing a small DDR4 kit to a large DDR5 kit tells you about the sizes and not the generations. The cost comparison page tests it at matched capacity and states the answer whichever way the numbers land.

Speed and latency figures in the table are the maker's stated specification and are shown as such. We do not rank DDR4 kits by them and we do not say one is better for anything; a stated rating is a property of the module, and what it means in your machine depends on your board and processor.

Is the bigger kit cheaper per gigabyte today?

Today the cheapest gigabyte on this generation is at 16GB ($4.43) and the dearest is at 64GB ($6.44). Moving up the ladder the larger kit is cheaper per gigabyte at 0 of 2 steps. Step by step: 16GB to 32GB: $4.43 to $5.97 per gigabyte (+34.9%), so the 32GB kit is dearer per gigabyte; 32GB to 64GB: $5.97 to $6.44 per gigabyte (+7.9%), so the 64GB kit is dearer per gigabyte.

Read that as the state of the shelf on the date above and not as a rule. The comparison is between each capacity's single cheapest in-stock kit, so it moves whenever one cheap kit sells out or appears, and a ladder that bends one way this week can bend the other next week with no seller changing a price.

The platform reality: the board decides

DDR4 only makes sense on a platform you already own. That is the decision the sources frame and it is the one we would put first: if your board takes DDR4, DDR4 memory is what you buy, and the price of DDR5 is irrelevant to you, because you cannot use it without replacing the board and usually the processor with it. If you are choosing a platform from scratch, the generation is one input among many, and the price gap between memory types is a small part of the cost of the platform underneath it.

The physical rule is absolute: DDR4 and DDR5 modules are keyed differently and will not seat in each other's slots. We do not restate the physical differences here; they are set out in DDR4 vs DDR5 and your board's manual is the authority for which it takes. As we read the public platform documentation, AMD's older AM4 desktop platform takes DDR4 only, and Intel shipped some processor generations on boards of either type, so the board's own specification page is the place to check rather than the processor's name.

Kits carry a stored profile, XMP for Intel boards and EXPO for AMD boards, that a supporting BIOS can apply to run the module at its rated speed. Without it a board runs the module at a default set by the standard. The rating is a specification we print and not a prediction of behaviour in your machine. Unbuffered ECC DDR4 exists, is recorded as a separate class, and is kept out of every consumer figure on this page.

What to do with this

Buying DDR4 in 2026 is usually a maintenance decision rather than an upgrade decision: a machine you rely on needs its memory replaced or extended and the board takes nothing else. In that case buy the capacity the machine needs, compare per gigabyte at that capacity on this page, and do not treat the current level as a signal to stock up. A working machine is not a reason to buy, and a spare kit bought in a panic is the most expensive kind.

Used and pulled modules are a legitimate part of the DDR4 market and our tables show their condition rather than mixing them into the new-condition index. A used kit priced well below a new one is not by itself a red flag, but the same plausibility logic applies: buy from a seller you can hold accountable, and check that what arrives matches what was listed.

Frequently asked questions