Nugget
macrumors 68020
It's not about "scaling up well", it's about being able to run the more intelligent models like Kimi K2.5, WITH enough space left over for a usable context window.
I'd say it's really about both of those things. Not only does a device need to have enough RAM to hold the model you're trying to run, but the amount of processing power that the device brings should also be appropriately scaled for the amount of ram. A theoretical 2TB unified memory device wouldn't "scale up well" if it had low memory bandwidth or an insufficient number of cores relative to that amount of memory.
I don't think that the 512GB M3 Studio was a particularly balanced product from a performance perspective. The ram (very high) and processing power (modest by 2026 standards) are not balanced in that product.