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steal_your_face ,
@steal_your_face@lemmy.ml avatar

Am I reading this right? The games performed better with less power? Why?

ylai OP ,

Undervolting provides the chip with additional power and thermal headroom, and can improved situations where otherwise throttling sets in.

kadu ,
@kadu@lemmy.world avatar

Undervolting aims to keep the same performance at a lower power draw. But because modern SOCs scale their frequency dynamically based on temperature, a lower voltage means slightly better performance

steal_your_face ,
@steal_your_face@lemmy.ml avatar

Oh interesting. Makes sense. Any idea why they don’t tune it like this from the factory? Stability?

kadu ,
@kadu@lemmy.world avatar

Yes. Essentially, every chip coming out of the fab will be slightly different, so you need to find a voltage curve that works for all of them. Some will be able to work with - 50mv, some -15, some won’t work at all unless they’re right at that factory defined voltage.

David_Eight ,

Think of amps and volts like a hose and water. If you put your thumb over the hose the water shoots out faster. Undervolting works in a similar way. So the goal is to lower the volts but maintain or even increase the amps to improve performance.

lea ,

This convinced me to play around with undervolting and I managed to do -50/-50/-40 (cpu/gpu/soc) while still passing furmark and all mprime tests, now I can play Stardew Valley for even longer!

Zaphod ,

The performance boost in Hitman 3 is interesting. Probably results from being able to keep a more consistent clock speed during intensive scenes because of lowered temps

FARTYSHARTBLAST ,
@FARTYSHARTBLAST@sh.itjust.works avatar

I was just about to ask how undervolting could possibly improve performance. Your explanation sounds pretty plausible.

steersman2484 ,

Lower temps and less power draw, which means you reach the thermal and power limit later.

filister ,

It lowers the temperature of the SOC allowing the CPU and GPU to run for longer periods without throttling. Meaning that you will have more consistent frames and low 1%.

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