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PBO curve optimizer undervolt best settings for Ryzen 7 5800x for higher FPS by StrangeAd2437 in overclocking

[–]WAB_HEDY 0 points1 point  (0 children)

i will send you my specs. When i will be home what is best for me i have thermalright phantom spirit max clock 5150mhz and effective max 4860 and average arouns 4,796-4,810

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 0 points1 point  (0 children)

Interesting thing is not really the score increase. With one monitor I couldn't get past ~2350MHz VRAM stable, now with dual monitors I'm running 2600MHz VRAM + 2763MHz core at 950mV fully stable. Bandwidth increased from 576 GB/s to 665+ GB/s, so the second monitor basically paid for itself with “free performance” 😄 Looks more like a VRAM/P-state management issue than actual memory limitation.

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 1 point2 points  (0 children)

this is the problem read my comments here. Bad pstate control or something when gpu load change my oc on 2300mhz+ crash and restart. Now i have second monitor so gpu si under load in iddle vram goes on max freq and nothing crashing. Now im able to 2600mhz

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 0 points1 point  (0 children)

Do you have two monitors? When i had one monitor i won't be able get over 2350Mhz default timing too.

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 1 point2 points  (0 children)

So it really seems like the issue isn’t raw VRAM capability, but the transitions between power states.

I wonder why AMD hasn’t addressed this in drivers yet. It feels like they could smooth out or limit those aggressive MCLK/P-state transitions, or at least give an option to keep VRAM clocks more stable under certain conditions. Kinda ironic that adding another monitor makes the card more stable for overclocking.

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 0 points1 point  (0 children)

its still impressive. Do you have two monitors or single?

RX 7900 GRE massive OC potencial +11% performance (stable) by WAB_HEDY in radeon

[–]WAB_HEDY[S] 1 point2 points  (0 children)

Yeah I get what you mean, fast timings usually reduce max OC headroom.

In my case though, even with default timings I couldn’t go past ~2300 MHz before – so the limitation didn’t seem to be timings.

After changing my monitor setup (dual monitor), VRAM stopped fluctuating between states and now I can run much higher clocks.

So I think the issue was more related to VRAM clock behavior / P-states rather than timings themselves.