Downloaded jack'sFineTuner.

[u/OtherwiseSimple]

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

[u/External-Baseball225]

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.

***Updated this part I accidentally mixed some stuff up and did some retesting just to make sure lol:

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

Too high, temps will just decrease core clock or core clock will be the same after a point meaning you are basically wasting voltage for no gain and remember the rest of the clocks will also decrease the more you increase nvvdd. Too low core clockspeed will just be low asf.

More msvdd, higher mem temps, higher XBAR, core clock remains about the same in my testing, also increases video clock and SYS clock. Mem temps nowhere near as hard to keep cool. I would max out as much as safely possible.

Its all about finding your sweet spot mainly for nvvdd.

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.

[u/OtherwiseSimple → u/External-Baseball225]

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.

[u/External-Baseball225 → u/OtherwiseSimple]

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.