According to the first leaks, the next generation of graphics cards will mostly remain at 16 GiB memory. The background is that the introduction of the first generation of GDDR7 will be based largely on modules with 16 Gb or 2 GiB, which are fast at 32 GT/s. In the long term, modules up to 64 Gb or 8 GiB and 48 GT/s are planned, but these will not be available at the start. The module sizes and bus bandwidths should then result in further models of the next generation, which shouldn't be that surprising.
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More movement is only expected with the second generation of GDDR7, where chips with 3, 4, 6 and 8 GiB will then be offered, which allow more flexibility in assembly – a 3 GiB chip would be rather unusual, even from the current perspective combinations too. But what actually goes into series production is often a matter of demand. For GDDR6X, for example, the 1.5 GiB chips were never produced in large quantities.
However, Micron is currently planning with 3 GiB modules, which could, for example, achieve 24 GiB total capacity with fewer modules. The higher bandwidth would also compensate for a narrower memory interface to some extent. With a 256-bit wide memory bus, GDDR6X achieves 768 GB/s and GDDR7 achieves 1,024 GB/s. This opens up design leeway for GPU manufacturers.
GDDR7 graphics memory: JEDEC defines new standard for Geforce RTX 5000 and Radeon RX 8000
The GDDR7 memory modules are expected on the Geforce RTX 5000 for the first time. What will be particularly interesting will be the amount of memory Nvidia, but also AMD, wants to compete with. 8 and 12 GiB are likely to have an increasingly difficult time and are only interesting for entry-level cards. But it probably wouldn't be surprising if Nvidia stuck to “weird” memory sizes.
Sources: 3DCenter, AnandTech, X/Twitter (Copite7Kimi)