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External vs internal gpu for LC0

Posted: Tue Dec 31, 2019 10:12 pm
by h1a8
I was thinking of getting a 2 in 1 laptop with an external gpu (2080ti) connected to thunderbolt or a desktop with the 2080ti. Would there be a significant difference in performance for Lela?

I was thinking if I got the 2 in 1 then I wouldn’t need a desktop.

Re: External vs internal gpu for LC0

Posted: Tue Dec 31, 2019 10:38 pm
by Hai
iPad Pro or MacBook Pro + 1-4 external RTX 2080 Ti

Re: External vs internal gpu for LC0

Posted: Wed Jan 01, 2020 3:02 am
by h1a8
Hai wrote:
Tue Dec 31, 2019 10:38 pm
iPad Pro or MacBook Pro + 1-4 external RTX 2080 Ti
I don’t understand.

Would there be a significant difference in performance between a laptop with external gpu (2080ti) connected via thunderbolt
Vs
Internal gpu (2080ti) for desktop?

Re: External vs internal gpu for LC0

Posted: Wed Jan 01, 2020 7:55 am
by Nordlandia
I can think of latency and PCIe x16 has twice as much bandwidth as PCIe x8 and four times as much bandwidth as Thunderbolt 3.

Image

Re: External vs internal gpu for LC0

Posted: Wed Jan 01, 2020 8:03 am
by Modern Times
Yes but how important is bandwidth for LC0 ?

Re: External vs internal gpu for LC0

Posted: Wed Jan 01, 2020 12:52 pm
by ankan
h1a8 wrote:
Tue Dec 31, 2019 10:12 pm
I was thinking of getting a 2 in 1 laptop with an external gpu (2080ti) connected to thunderbolt or a desktop with the 2080ti. Would there be a significant difference in performance for Lela?

I was thinking if I got the 2 in 1 then I wouldn’t need a desktop.
lc0 isn't much bottlenecked by PCIe bandwidth so I wouldn't expect significant different in performance. Maybe about 5%.