[Anand] AMD Moves From Infinity Fabric to Infinity Architecture: Connecting Everything to Everything - Overclock.net - An Overclocking Community
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[Anand] AMD Moves From Infinity Fabric to Infinity Architecture: Connecting Everything to Everything

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post #1 of 21 (permalink) Old 03-06-2020, 11:57 AM - Thread Starter
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[Anand] AMD Moves From Infinity Fabric to Infinity Architecture: Connecting Everything to Everything

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Another element to AMD’s Financial Analyst Day 2020 was the disclosure of how the company intends to evolve its interconnect strategy with its Infinity Fabric (IF). The plan over the next two generations of products is for the IF to turn into its own architectural design, no longer just between CPU-to-CPU or GPU-to-GPU, and future products will see a near all-to-all integration.

AMD introduced its Infinity Fabric with the first generation of Zen products, which was loosely described as a superset of Hypertransport allowing for fast connectivity between different chiplets within AMD’s enterprise processors, as well as between sockets in a multi-socket server. With Rome and Zen 2, the company unveiled its second generation IF, providing some more speed but also GPU-to-GPU connectivity.

This second generation design allowed two CPUs to be connected, as well as four GPUs to be connected in a ring, however the CPU-to-GPU connection was still based in PCIe. With the next generation, now dubbed Infinity Architecture, the company is scaling it not only to allow for an almost all-to-all connection (6 links per GPU) for up to eight GPUs, but also for CPU-to-GPU connectivity. This should allow for a magnitude of improved operation between the two, such as unified memory spaces and the benefits to come with that. AMD is citing a considerable performance uplift with this paradigm.

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post #2 of 21 (permalink) Old 03-06-2020, 12:41 PM
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It will be interesting to see what kind of CPU-to-GPU connectivity they will come up with that's still compatible with PCI Express.

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post #3 of 21 (permalink) Old 03-06-2020, 01:57 PM
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so can a laymen such as me run more CPU's in a config without QPI links and 2 gpu's that act like one?

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post #4 of 21 (permalink) Old 03-06-2020, 11:31 PM
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The weird thing is CPU+GPU "Packages" used to be standard, every console before PS4/XOne was a collection of separate chips soldered to the motherboard.
Why can't anyone do that in the PC space? (Not necessarily soldered to the motherboard, but with Ryzen we have plenty of chips in a package now, every Intel CPU for years has had video output circuits, adding a DGPU into the mix shouldn't be hard.)

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post #5 of 21 (permalink) Old 03-07-2020, 04:07 AM
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Quote: Originally Posted by ILoveHighDPI View Post
The weird thing is CPU+GPU "Packages" used to be standard, every console before PS4/XOne was a collection of separate chips soldered to the motherboard.
Why can't anyone do that in the PC space? (Not necessarily soldered to the motherboard, but with Ryzen we have plenty of chips in a package now, every Intel CPU for years has had video output circuits, adding a DGPU into the mix shouldn't be hard.)
Multiple CPU and GPU vendors requiring a generic platform integration such as PCI-E.

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post #6 of 21 (permalink) Old 03-07-2020, 04:22 AM
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Quote: Originally Posted by mouacyk View Post
It will be interesting to see what kind of CPU-to-GPU connectivity they will come up with that's still compatible with PCI Express.
i think this one is a proprietary interconnect with a similar design as Nvidia's Tesla V100 SXM2 cards making use of NVLink.
or in other words, Infinity Fabric would become what NVLink proposes to do which only IBM took up the joint project.

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post #7 of 21 (permalink) Old 03-07-2020, 09:40 AM - Thread Starter
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Quote: Originally Posted by ACleverName View Post
so can a laymen such as me run more CPU's in a config without QPI links and 2 gpu's that act like one?
Part of the hurdle of pooling all GPUs to act and funtion as a single, more powerful resource pool is the need for unified memory between all devices. This brings that along with much higher bandwidth than PCI-E 4, so yes it will help you run more GPUs and it will bring about using multiple GPUs acting like a single big one.

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post #8 of 21 (permalink) Old 03-07-2020, 10:11 AM
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Another part of the hurdle is coordinating resources. Having a single, separate graphics command processor linked via infinity fabric controlling the chiplets would work, but the latency would be a pita.
No central coordination would just be a modified form of current mgpu- splitting load or taking turns.
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post #9 of 21 (permalink) Old 03-07-2020, 11:36 AM
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Quote: Originally Posted by mouacyk View Post
It will be interesting to see what kind of CPU-to-GPU connectivity they will come up with that's still compatible with PCI Express.
eventually the the CPU and GPU will be the same chip


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post #10 of 21 (permalink) Old 03-09-2020, 10:27 AM
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Quote: Originally Posted by cdoublejj View Post
eventually the the CPU and GPU will be the same chip

https://www.youtube.com/watch?v=eXhlDt2SD8o
Yep. APUs are coming along, but it will probably be some time before we see one that is true gaming grade.

Feel free to correct me. I'm right just as often as I am wrong. Or wrong as equally as I am right at least. I dunno I could be wrong about that..


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