When AMD started using TSMC’s 7nm process for the Zen 2 processor family that launched in November 2019, one of the overriding messages of that launch was that it was important to be on the leading edge of process node technology to be competitive. That move to TSMC N7 was aided by the small chiplets used in the desktop processors at the time, ensuring a higher yield and better binning curves for desktop and enterprise processors. However, between now and then, we’ve seen other companies take advantage of TSMC’s 5nm, 4nm, and talk about TSMC’s 3nm process coming to market over the next 12-24 months. During our roundtable discussion with CEO Dr. Lisa Su, I asked if the need to stay on the leading edge still held true.

To put this into perspective, AMD announced late in 2021 that it would be using TSMC’s 5nm process for its Zen 4 chiplets in enterprise CPUs in the second half of 2022. Then in early 2022, the company reiterated the use of Zen 4 chiplets, but this time in desktop processors again by the end of 2022. This is a significant delay between the first use of TSMC 5nm by the smartphone vendors, which reached mass production in Q3 2020, with Apple and Huawei being the first to take advantage. Even today, if we go beyond 5nm, Mediatek has already announced that its upcoming Dimensity 9000 smartphone chip is on TSMC 4nm and will come to market earlier this year. TSMC’s 3nm process is expected to ramp production at the end of 2022, for a consumer launch in early 2023. By those metrics, AMD is behind a process node or two by the time Zen 4 chiplets come to market later this year.

I asked Dr. Su in our roundtable about whether the need to be on the leading edge process is critical to be competitive for them. Having innovated around chiplets, I asked whether being the lead partner with foundry partners and packaging partners (known as OSATs) is of major importance, especially when the lead competition seem ready to throw money at TSMC to take that volume. How would AMD be able to aggressively assert a market-leading position in light of the complexity of manufacturing and the financial power of the competition?

Dr. Su stated that AMD is continuing to innovate in all areas. For AMD it seems, leading the chiplet technology has helped to bring the package together. She went on to say that AMD has had strong delivery of 7nm, is introducing 6nm, followed by Zen 4 and 5nm, talking about 2D chiplets and 3D chiplets – AMD has all these things in the tool chest and are using the right technology for the right application. Dr Su reinforced that technology roadmaps are all about making the right choices and the right junctures, and explicitly stated that our 5nm technology is highly optimized for high-performance computing – it’s not necessarily the same as some other 5nm technologies out there.

While not explicitly stating that the need to be leading edge is no longer critical, this messaging follows the enhanced narrative from AMD that in the era of chiplets, it’s how they’re combined and packaged that is becoming important, arguably more important than exactly what process node is being used. We’ve seen this messaging before from AMD’s main competitor Intel, where back in 2017 the company stated that it will heavily rely on optimized chiplets for each use case – this was crystallized further in 2020 suggesting 24-36 chiplets on a single consumer desktop processor for purpose-built client designs. That being said, it has been constantly rumored that Intel will be a big customer of TSMC 3nm in the following years, so it will be interesting to see where AMD can take advantage of several years of chiplet expertise and packaging tools by comparison.

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  • dotjaz - Tuesday, January 11, 2022 - link

    AMD can't be on N3 anyway. Zen4 would be running at something like 3.2GHz base and 3.8GHz boost if it were on N3.
  • Sunrise089 - Monday, January 10, 2022 - link

    I agree. This reads like Ian needed to write SOMETHING based on his roundtable interview and decided to punch it up a little without having the data back up the narrative being pushed here.

    Honestly if Ian thinks AMD should have delayed Zen 4 to align with node availability (at the cost of a worse competitive landscape) he should just say that. No reason to take what is an editorial opinion and try and turn it into a reporting story though.
  • Sychonut - Monday, January 10, 2022 - link

    I think a more honest answer would have been "Well, we are in the lead and Intel is stuck on 10nm. What's the incentive to move fast and forgo milking the cow as long as possible?"
  • demian_thorne - Tuesday, January 11, 2022 - link

    true dat LOL
  • sgeocla - Tuesday, January 11, 2022 - link

    There isn't a better TSMC process than 5nm for HPC this year or next year. Even if AMD delayed Zen4 a lot for 3nm availability they would not have had enough wafers to make anything in volume and it would have cost a fortune. Just look at Intel with 10nm and how long they took to make something in significant quantity like Alder Lake and how they had to sell 14nm+++ at a significant discount in the mean time.
  • ricebunny - Tuesday, January 11, 2022 - link

    The author made an unsubstantiated claim that TSMC’s 2020 5nm process was suitable for AMD’s Zen CPUs in terms of frequency scaling.

    The whole article went south from there.
  • Foeketijn - Tuesday, January 11, 2022 - link

    The most important AMD part that needs a different process node, is the I/O die in the Epycs. That is drinking to much juice from the total power envelope that could be used to feed the dozens of thirsty cpu cores.
  • Wrs - Tuesday, January 11, 2022 - link

    I don’t think they can shrink it because it’s connected to so many pins powering so many ports and slots. The only advantage of printing it on 7nm would be power efficiency at an enormous wafer cost.
  • Vitor - Tuesday, January 11, 2022 - link

    If I were Nvidia, I would throw crazy money for TSMC 4nm. If the they managed to have incredible gpus with Samsung shitty 8nm, imagine what they can achieve with a way superior node.

    And I hope we get a PS5 Pro by the the time of 3nm. That can run stuff 1440/120.
  • Silma - Tuesday, January 11, 2022 - link

    TLDR: We're forced to drool on Apple's chips for another year because Intel is so late and AMD and NVIDIA are too occupied price gouging their consumers and don't feel the need to compete.

    By this time, Apple user will get laptop with 3 nm Chips that will consume 20 % less energy than with 5 nm, stay fresh as 100 % CPU utilization and probably 20 % faster too.

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