Why aren't CPU's 3-dimensional?

Why aren't CPU's 3-dimensional?

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Like V-NAND?
We've had "Tri-Gate" since 22nm, it's kinda there.

Why are CPU's flat like chips instead of cube shaped? Surely you could fit more processing power into the latter?

But they are

heat

Spherical then.

heat

If you're asking why aren't they a cube, then it's because of a couple reasons. The main one being how the N and P Wells are formed on the chip. It's hard to give chips depth when you flood fill N and P Wells. Also, metal capacitance has become a big issue sub 18nm. Once you start trying to use more than 3 metal layers it gets pretty bad.

b/c organics degrade after lithograph exposure, the exact opposite of what you want when looking at non-conductive layers

layers with air/material separation between

megagames.com/news/ibm-flows-water-through-3d-cpu-chips-super-cooling

Why aren't they more spread out then? Just recently did we get wallet sized cpus but I always wondered if heat was such an issue why not spread it? I guess some components do need to be physically as close as possible, and that the small differences between heat on the die may mean less mechanical reliability in the long run.

They do, both IBM and the AMD EPYC are huge.

That's even worse
You want to maximise surface area, not minimise it.

electricity doesn't travel instantly the bigger the distance the harder it is to keep the cpu running properly

If you put parts too far apart the speed of light starts being a significant concern.

A 6 gigahertz processor goes through 6,000,000,000 cycles per second. If one 'half' of the cpu had to send a signal to the other half every cycle, they could be no more than about 5cm apart.

Why aren't girls 2-dimensional?

heat

On a planetary scale electricity is pretty much instant

Only because you're thinking on a human timescale, or about a billion times slower than CPU timescale.

If you want it to be as fast as possible, you want the connections to be short.

And if you want to make and sell as many of these chips as possible, you don't want to waste space on your wafers. These things are already damn expensive; you don't want to give up any area that you don't have to.

Because nobody in the fucking top decided to pay to fucking invent it those ignorant fucks.

Every physical object is 7 dimensions dumbass. Width x Height x Depth x Length x Size x Weight x Time.

Woah shit looks EPYC bro!

Again, electricity only travels at the speed of light, 3x10^8 m/s
if your CPU cycles at 3 gigahertz, aka 3x10^9 m/s, light only travels 10cm per cycle.
with 6GHz it's 5cm, and if you have a 12GHz cpu it'll only travel 2.5cm in that time.

>size

What is size here, and how is it separate from width x height x depth x length?

AMD should really release a 3D cpu I would ditch Intel

When housefire is not enough, turn it into a nuclear plant.

heat definitely but simply from the perspective of the manufacturing process it makes more sense as well.

Transistors are basically print on paper at this point.

multilayered is probably a better word than 3d

Dam

Gabriel's Horn?

unfortunately the silicon atoms making up the chip have nonzero size, unlike the magic imaginary "points" in your math papers

look up the most absolute basic shit about the CPU manufacturing process and you would see why this is retarded
there are sub-5-minute youtube videos that will stop you from asking dumbass questions