Nvidia and "4nm" — Blackwell, Rubin and the Node That Isn't

Nvidia's chips are described everywhere as four nanometre chips. Nvidia has never sold one, and has said so in public, in writing, on its own site, for four years.

This is a close reading of one company's own architecture posts across three generations of hardware, watching what each of them says about the process the silicon was made on.

2022, Hopper: 'fabricated using the TSMC 4N process customized for NVIDIA' — 80 billion transistors, a die of 814 mm². Note the word customized: a variant made to order, with no published specification anywhere.

2021, the foundry's own press release: TSMC describes N4P as 'the third major enhancement of TSMC's 5nm family', with every figure a ratio against a named predecessor — 11% more performance than N5, 6% more than N4, 22% better power efficiency, 6% more density. So the four was already a refinement of a generation labelled five before any customisation.

Also: TSMC's N4 and Nvidia's 4N are different strings naming different things, and they are transposed constantly. One is a catalogue product; the other is bespoke and has no public parameters at all.

2024, Blackwell: 'manufactured using a custom-built TSMC 4NP process' — 208 billion transistors, and the phrase the second half of the film rests on: 'two reticle-limited dies connected by a 10 terabytes per second chip-to-chip interconnect'. The die area Nvidia published for Hopper is gone.

2026, Rubin: nothing. Nvidia's own architecture post of 21 July 2026 gives 336 billion transistors, two reticle-limited dies on one package, up to 288 GB of HBM4 at up to 22 TB/s, NVLink 6 at 3,600 GB/s — and names no process, no foundry and no node anywhere in the document. That was checked term by term and is reported as an absence, not as concealment.

Then the half that explains it. The limit these parts are built against is not the nanometre, it is the reticle — the largest pattern a machine can print in one exposure. Hopper's 814 mm² die was already at it, which is why Blackwell and Rubin are each two dies and a link, sold and reasoned about as one accelerator. The transistor count quadruples across three generations; the individual die never grows, because it cannot.

And finally the arithmetic. Blackwell's headline 20 petaflops is at FP4; Hopper's 4 petaflops is at FP8. Hold the number format constant and the gap is about 2.5x, not 5x. Both figures are honest; only one of them is a comparison. Plus the two habits that survive in the sources and never survive being quoted: the three-word footnote 'with sparsity' under Nvidia's H100 table, and the words 'up to' in front of almost every Rubin figure.

Sourcing note: Nvidia and TSMC are the primary sources for their own products and are both selling the thing described. Where a figure comes from the company that makes it, the film says so on screen. Trade-press figures — the 858 mm² reticle maximum and the FP4-versus-FP8 comparison — are labelled as trade press with their dates.

Educational documentary. Not financial or investment advice.