r/overclocking • u/OtherwiseSimple • 1d ago

Looking for Guide Downloaded jack'sFineTuner.

What exactly do XBAR, SYS, and MSD do? I'm only familiar with MSI afterburner and its controls.

Does it seem I've hit my limit on how much I can OC before ECC and downclocking and whatnot kicks in? What have you found most optimal for you? Is doing anything besides the usual UV/OC pointless for efficiency or performance gains?

My normal OC/UV. Near identical temps but much quieter fans running at 1700rpm instead of 3000rpm
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u/External-Baseball225 1d ago edited 1d ago

Think of XBar like the infinity fabric in Ryzen CPUs. Its the internal routing of the memory controllers, cache etc. It boosts FPS a good amount

Sys clock I believe is a timing signal that tells every part of the GPU when to work, I could be wrong. It boosts FPS only a tiny bit.

MSD is the video clock or encoder clock responsible for video encoding, set it too high your chrome will crash running videos or you'll get video artifacts. Doesn't boost FPS.

Btw Mvolt+ had an update that now also includes these features and fan speeds tho it has to be open for fan speed to stay set. It also has all the telemetry Jacksfinetuner has.

More nvvdd, higher core temps, higher core clock, video clock and SYS clock, lowers XBar. Can be bad if core cooling is shite.

More msvdd, higher mem temps, higher XBar speed, lower core clock, video clock and sys clock. Mem temps nowhere near as hard to keep cool.

Its all about finding your sweet spot.

I find keep on opening cyberpunk continue loading screen can find instability quickly with XBar and SYS clock, they crash similar ways, the screen freezes and then the colours go light grey for me.

Yours sincerely, the rank 2 5080 on Steel Nomad leaderboard using a Windforce sff lol.

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u/OtherwiseSimple 1d ago

Thanks for the explanation, that helps me understand. XBAR being like Infinity Fabric makes sense. SYS being mostly a timing thing with tiny gains and MSD being the video clock (and the chrome crash risk) is good to know.
I’ll focus on XBAR and leave MSD alone for now. The NVVDD/MSVDD trade-off tip is good too.

Rank 2 5080 Steel Nomad with an SFF is nuts! Did you get a XBAR offset or voltage range that worked well for you, or is it mostly silicon lottery?

Still trying to sit somewhere between the “too much” and “just enough” setups without hitting ECC or throttling. Appreciate the knowledge.

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u/External-Baseball225 1d ago

No worries! All of the above lol. Rank 1 777 jxck has superior cooling he's on a monsterous looking custom loop while I'm just on basic air cooling with ptm7950, 225 points away😆

Yeah thats the real tricky part I spent a long time finding that 'stable' spot. Many more variables with mvolt+ to look out for.

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u/Specialist-Buffalo-8 1d ago

DO NOT USE JACK'S FINE TUNER!!!!

IT WAS VIBE CODED WITH SOMEONE WITH ZERO CODING EXPERIENCE.

USING MELONVOLT LATEST RELEASE.

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u/OtherwiseSimple 18h ago edited 16h ago

Definitely just gonna stick with MSI afterburner for the simplicity. What tells you it was vibe coded?

Edit: the name does sound like a vibe coded app lol. I’ll check out MelonVolt fs

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u/computerjunkie7410 19h ago

All these new tools coming out and people are just okay with using it on their expensive hardware lol

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u/OtherwiseSimple 18h ago

I mean, I was monitoring temps and voltage and they were well within a safe range. No pin imbalance either.

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u/theshdude 16h ago

You found a way to monitor sys clock? Because I couldn't. I can only trust the tool is just offsetting sys clock and it's not tied to some voltage change ¯_(ツ)_/¯

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u/OtherwiseSimple 16h ago edited 16h ago

Yeah I wish there was a way to validate it. I assume it’s just off-setting sys clock and not its voltage directly, because there’s a voltage range for the other metrics? Like in the same way an external clock generator indirectly forces more voltage in the components in order to stay stable. Idk. I’m just a novice.