I feel like you have been getting Tile memory registers mixed up with traditional dedicated video RAM throughout the entire thread. Not the same thing at all. Forget Tile memory. It is just a super short term buffer or cache area used to store tiny pieces of data for the next instruction/operation. It is not really RAM at all in the sense I think you are interpreting it.
Stick to speculating on the amount of unified system RAM, which I also agree will start at 16GB across all Apple Silicon systems (except those higher end systems that may start at 24-32GB instead). I do feel the DTK specs are a good indication of what the lowest common denominator will be - so if you have developed targeting the DTK as your app’s performance baseline, you will be more than good to go when commercial Apple Silicon ships to end users.
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I agree with this, but we have to remember that iMacs are for the most part still consumer level products. Also, we don’t know what the redesign is going to look like. I have a feeling that they are going to be as thin as whatever display technology they decide on will allow rather than the Silicon and other hardware.
Expect an almost impossibly thin design, possibly even with rounded corners like the iPad Pro, and a stand taking big design cues from the Pro Display. We’re not going to get anything like the current design, just with Apple Silicon in it.