On Friday, 28 June 2024 19:24:58 CEST Mario Limonciello wrote: > On 6/28/2024 12:05, Diederik de Haas wrote: > > On Friday, 28 June 2024 18:37:06 CEST Mario Limonciello wrote: > >> On 6/28/2024 11:18, Diederik de Haas wrote: > >>>> I don't think so. I've never heard of this actually used in a desktop > >>>> board. It's for mobile designs AFAIK. > >>> > >>> I can understand that the initial/original goal/target was mobile. > >>> But is there a(ny) technical reason why it couldn't also support > >>> 'desktop' > >>> systems? > >>> IIRC and IIUC it does need Zen 3, which my CPU/SoC does. > >> > >> It needs information about the hardware thermal design to change the > >> correct coefficients. > > > > Isn't that something that AMD would know? > > I have software interfaces that I can use to tell you what APU > coefficient is currently programmed. I can tell you what the MAX an APU > can support is but I can't tell you what the "rest" of the hardware > design can support. > > This depends on hardware stuff. For example: > 1) how big of a heat pipe there is > 2) how big of a power supply there is > 3) how many fans there are > 4) is there a beefy GPU sharing power > 5) etc. > > Even if you have the thermal headroom if you turn PPT limits up too much > your GPU performance might suffer.
As this will normally be a headless system, I'm actually looking if I can turn the GPU off, *unless* there's an HDMI cable plugged in. So (at least for now), the GPUs only function is to have a display when I need it for troubleshooting. > Designers do thermal simulations to come up with the numbers for all > this stuff and it's proprietary information to go with their design. > > That's why it's encoded in BIOS or EC and OS will read it and offer the > interface to the user. I really don't think it makes sense in a design > it yourself desktop. Ah, ok. Clear :-) I (initially) thought you meant hardware thermal design *of the CPU*, but I now know it's 'a bit' more then that. Thanks, Diederik
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