[FFmpeg-devel] Hardware purchase request: AVX512-capable laptop

[James Almer]

On 1/2/2024 9:56 PM, Lynne wrote:
> As some of you know, my laptop died nearly 2 years ago, and
> I've been working on a desktop machine, which is currently a Zen 3.
> AVX512 has become more popular in the meantime, with Zen 4
> and future AMD CPUs shipping with it, but currently, we have very
> little AVX512.
> In short, I'd like a machine which runs an AVX512-capable
> AMD CPU, and as the world is opening up more and more, I'd
> like for it to be portable.
> 
> I've looked around a lot, but as Intel still has a firm monopoly,
> the options are limited (7940H(S), 7945HX, 7845HX, 8945HS).
> What I think I've settled for is an ASUS Vivobook Pro 15, with a
> 7940HS CPU (the second least powerful Zen 4 mobile CPU),

7940HS is the highest Ryzen 9 model from the 7040 series. Not sure where 
you got second least powerful from.

https://en.wikipedia.org/wiki/List_of_AMD_Ryzen_processors#Phoenix_(7040_series,_Zen_4/RDNA3_based)

> currently trading for 1999.0 EUR on amazon.de.
> 
> https://www.amazon.de/-/en/Vivobook-Display-R9-7940HS-Windows-Keyboard/dp/B0BRYTS8MR
> 
> The other alternative I've found is a Lenovo Legion 7 Pro, but
> it's more expensive at 2399 EUR (currently seems temporarily
> discounted due to the holidays).

I see a Lenovo Yoga Pro 7 available for 1099 EUR. 
https://www.amazon.de/-/en/Lenovo-Display-Graphics-Blue-Green-Premium/dp/B0CGLPVQHK/

Same amount of RAM, screen resolution and storage, and a Ryzen 7.

> The Lenovo IdeaPad still hasn't been refreshed and uses a Zen 3 CPU,
> so it doesn't fit the requirements. I'd take other options, but after
> all the looking I did, the only other laptops to feature Zen 4 CPUs are
> rather pricy gaming laptops with high-end NVIDIA GPUs, starting at 2500 EUR
> and going up.

The Vivobook has a discrete Nvidia GTX 4060, which makes it a gaming 
focused laptop too.

> I'd be happier with the Vivobook. The OLED screen is a nice bonus too.
> 
> I'd be open to ARM-based Apple laptops too, but we already have a
> shared M1 machine, and I'm not really a big Fedora fan. RISC-V is obviously
> still out of the question at this point.
> 
> As for my plans for AVX512, I'll first add limited 32-register version of the FFT,
> which wouldn't be too hard to do, and looking into modifying the existing
> recombination function to work on 16-point basis. I'll also look into
> modifying other trivially extendable code like the float_dsp.
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