3 ms·
Density is mass per volume so how are you comparing it to a planar transistor? Your units don't even match.
by measurablefunc 3mo ago
Density is mass per volume so how are you comparing it to a planar transistor? Your units don't even match.
- bronson 3mo agohttps://en.wikipedia.org/wiki/Transistor_count#Transistor_density https://en.wikipedia.org/wiki/Transistor_count#Transistor_de...
- gruez 3mo agoNot all densities is mass per volume. eg. population density.
- measurablefunc 3mo agoIt's a physical quantity per some unit of spatial measurement so the units still don't match up b/c in one case the transistors are stacked per volume & in the other case per area. > Historically, "node" sizes (like 28nm or 7nm) directly correlated to the physical length of a transistor's gate. Today, names like 3nm or 2nm reflect a marketing generation. The actual transistors are significantly larger than these nanometer labels, meaning density varies between companies > Research organizations like IEEE have proposed new metrics, such as transistors per cubic millimeter (MTr/mm^3), to accurately map future 3D scaling. However, commercial chip foundries resist this change because it would make it harder to calculate commercial yields and thermal density limits using standard industry formulas. https://share.google/aimode/Z5BqUjlZWFNphm6Z6 https://share.google/aimode/Z5BqUjlZWFNphm6Z6
- formerly_proven 3mo ago> It's a physical quantity per some unit of spatial measurement so the units still don't match up b/c in one case the transistors are stacked per volume & in the other case per area. "Planar" and "3D" in this context refers to the shape of the transistors themselves. In a planar transistor the functional structure is spread out in the area, like this: https://en.wikipedia.org/wiki/File:MOSFET_functioning_body.svg https://en.wikipedia.org/wiki/File:MOSFET_functioning_body.s... while 3D transistors spread into the volume: https://en.wikipedia.org/wiki/Multigate_device#/media/File:Doublegate_FinFET-en.svg https://en.wikipedia.org/wiki/Multigate_device#/media/File:D... However the active devices are still just one layer. This isn't like 3D NAND where you actually have transistors on top of each other. So the comparison only considers the area for both kinds of transistors.
- measurablefunc 3mo ago[flagged]
- roetlich 3mo agoWell, this seems like a very dangerous way of using AI. If you keep pushing until you get back an answer that makes sense to you, you might just get your own believes fed back to you.
- measurablefunc 3mo ago[flagged]
- sbergot 3mo agoThe comparison is good. Humans are also stacked in volumes and we still measure population density over a surface because the third dimension is less significant in this context.
- measurablefunc 3mo agoI got the answer from the AI I was looking for & it makes sense. You can try to map the volumetric density to areal density but the mapping is not canonical so it doesn't say anything about the physical reality of actual transistor density since the reality is that it is a volumetric measure that gets fudged for marketing purposes. 3D volume for chips is going to keep increasing so they will eventually transition to measuring density over volume instead of area.
- zmgsabst 3mo agoPopulation density isn’t planar, eg, why cities are denser than towns: their centers are more than 2D.
- short_sells_poo 3mo agoPopulation density is literally measured over a planar metric: people/km^2 You are suggesting it's measured over a cube volume?
- jonsen 3mo agoThere are some really dense people
- rycomb 3mo agoSome people are dense... now in three dimensions!
- dodslaser 3mo ago3d population density would be an interesting measure, though. It would provide a better feel for how cramped a populated volume actually is. It would have to be the displacement volume, to account for cities with only a few really tall buildings, and also somehow adjusted for buildings with high ceilings.
- john_strinlai 3mo agodensity is quantity per unit measure. mass per volume is one example.
- amirhirsch 3mo agoDensity is this reply.
- bandrami 3mo agoAll "density" means is that it's a quotient; I use spectral densities daily and that's "count per Hertz" which weirdly enough works out in normal units to be seconds.