It’s probably more. Pretty conservatively, if the KV embedding dimension for each token is ~10K x 100 attention layers (this is roughly the scale of Llama3.1 405B) that’s already 1M 16-bit floats per token = 2MB. They have likely needed to implement some kind of KV compression (like DeepSeek) to make this even feasible.

There are some errors in you calculation.

> A token is 32-bit integer.

No, in transformer, token is a vector, for larger models it is probably something like 6k-12k floats, assuming larger model sizes. Assume 8-bit precision, a token is more like 6-12kB, per token.

So assume 100k tokens, you will end up with 554MB for input tokens, ALONE.

Depending on your model architecture, the memory could vary, but from my observation, the runtime memory increase is at least on the same magnitude with the initial amount of memory usage upon loading the model, and this is for a moderate context length (<32k), and will grow linearly, if we don't count the n*n KV matrices.

So you are easily looking at caching 10~100GB of data, in a very hot state, and that is going to be very expensive indeed.

It's probably much more than a single GB of data for a million tokens.

It's not. You're confused and don't understand what you're talking about. Just read all the replies you've already gotten and try to understand why you're wrong instead of doubling down on an incorrect take.

It's more likely some 400GB of data.