this post was submitted on 28 Aug 2024
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What I was alluding to with regards to idle mclk behaviour is that there are two factors at play: vertical balanking interval and combined display bandwidth.
Your mclk will idle high with 'incompatible' VBIs, and it'll also idle high to sustain a lot of display throughput.
This can be observed regardless of GFX vendor, though symptoms may vary somewhat between them. I suppose it could be considered a limitation of GDDR (the same behaviour was never really observed on HBM GPUs like the Vega 64 or Radeon VII)
That said, friends of mine have fixed various multi-display specific issues using nvidia profile inspector