dvizr
Newbie Boot Camper
Posts: 5
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Post by dvizr on Apr 15, 2021 1:48:41 GMT
This may be overly ambitious, but I’m hoping to stream from a 2017 (Edit: It’s actually a 2018) MBP using the Radeon Pro 555X card. The standard AMD driver doesn’t offer encoding codecs, and game captures routinely grind to 100% frame loss in OBS. I’m hoping the customizations offered by the Red version will allow me to tweak my settings so I can play without the stream completely halting. Is this even necessary, or will the Blue version work better?
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Post by .:Hydrogen:. on Apr 15, 2021 4:35:36 GMT
The red drivers are optimized for gaming and have better recording/streaming interfaces. However, I have the 2018 Macbook Pro with the 560X and recording does not work for me (i get a green screen, even with installing the AMD app SDK). You can give it a try. I would suggest that you try the latest (March) version, and if it does not work roll back to the previous (february) version.
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dvizr
Newbie Boot Camper
Posts: 5
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Post by dvizr on Apr 15, 2021 5:53:47 GMT
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dvizr
Newbie Boot Camper
Posts: 5
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Post by dvizr on Apr 15, 2021 7:01:29 GMT
Upon further testing, it appears the CPU is locked and doesn't allow voltage regulation.
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Post by .:Hydrogen:. on Apr 15, 2021 13:20:23 GMT
yeah...it's been like that since skylake (6th gen) for apple  I would suggest that you just disable turbo boost and limit cpu power draw between 20-45 watts (depending on your preference). I have the 8850H and disable turbo boost and limit cpu power to 45 watts on both long and short and clamp on both limits so that the power draw does not exceed. |
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dvizr
Newbie Boot Camper
Posts: 5
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Post by dvizr on Apr 16, 2021 21:34:55 GMT
I finally figured it out. I can now stream using the x264 codec at 6000 bitrate (with a 12000 custom buffer) and even get consistently above 50 FPS on 3D games while streaming. The key is to use the native resolution of 2880*1800 with a custom scaled output of 1152*720 to keep the downscaling calculations simple.
I set all power limits to 48W (PL1, PL2, and PL4). I left PL2 unclamped, but will try clamping to see if it helps. I tried all ranges between 35-60W and found 48W to be the sweet spot.
I also left Turbo Boost and SpeedStep on, but disabled Speed Shift. I tried all combinations of these settings and found this to be the best.
I have MacsFanControl tied to the CPU PECI sensor on a 50C-70C curve for both fans.
With these settings, I've been able to get the CPU to run at a peak of 3.05 GHz without ever rising above 75C. I no longer get CPU spikes or heat issues, and the machine hums along pretty effectively. Too bad they didn't start undervolting out of the factory until the next year, so this is the red-headed stepchild, but with some tweaking I almost don't notice.
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