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 Post subject: Thunderbolt 4
Post #1 Posted: Mon Nov 22, 2021 1:35 am 
Judan

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The speed of Thunderbolt 4 is up to 40 Gb/s = 5 GB/s.

Thunderbolt 4 via PCIe is up to 32 Gb/s = 4 GB/s.

(b = bit, B = Byte)

I wonder whether it is fast enough for eGPUs and AI programs, such as KataGo.

For comparison,

Code:
PCIe 3.0  8x =                7,9 GB/s
PCIe 3.0 16x = PCIe 4.0 8x = 15,8 GB/s
PCIe 4.0 16x = PCIe 5.0 8x = 31,5 GB/s
PCIe 5.0 16x =               63,0 GB/s

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 Post subject: Re: Thunderbolt 4
Post #2 Posted: Fri Dec 03, 2021 7:43 am 
Beginner

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Is the bus bandwidth a limiting factor for Go engines? You can certainly get eGPUs on Thunderbolt 3 which are capable of moving 25fps ish 4k ish video over the bus. If you had a GPU-only implementation of a Go engine it would only need to be receive the board state, and then later return the co-ordinates of its move, which is far less data.

Since you're asking, I guess there's lots of CPU <-> GPU communication as the AI decides its move? How do they work?

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