GPU power limit %?

[Chaotic0ne]

I hear people saying they raised this up and got stable overclocks without raising the voltage, but I've never personally seen an example where raising power limit % would make an OC stable when it was unstable before. As far as I can tell, on AMD cards, raising the power limit is irrelevant to overclocking. Unless I'm doing something terribly wrong here and there is some sort of science behind raising the power limit a certain % depending on the voltage & core clock. But what's confusing me more than anything is why have otherwise stable overclocks been made unstable by raising the power limit %?

 

[SimianR]

On my R9 290 if I raised the GPU clock without touching the power limit there was times where it would not sustain the clockspeed without raising the power limit as well. At least that was what I observed through the Afterburner Onscreen display.

 

[RaulF]

As i understand it raising the power limit lets the GPU pull more volts to keep a certain clock before it down clocks.

 

[tential]

On my R9 290 if I raised the GPU clock without touching the power limit there was times where it would not sustain the clockspeed without raising the power limit as well. At least that was what I observed through the Afterburner Onscreen display.

This is what I have observed as well on my HD7950.