GPU OC problems

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Zaje23

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i have a gigabyte r9 380 and i've been trying to overclock it for a while but am only able to get a very small overclock, if i take it any higher it shuts down. my question is what is the most important factor when overclocking a GPU and how can i overcome the barrier of the shut down, aside from buying a new GPU.
 
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Ok. Well, like I said, those clocks aren't anything to be ashamed of. If you do want to start increasing voltage, I would go with 5-10 mV increments, again keeping a close eye on temps. You can probably go ahead and increase power limit to the max, it won't really hurt anything (it doesn't automatically use more power, just allows the card to if it needs to).

But for myself, I found that when I had to start increasing voltage I ran into diminishing returns quite quickly. I got to 1100 core at stock voltage, and had to go up to +50 mV to get to 1150, and temps were rising dramatically. I ended up going with stock clocks and actually undervolting my GPU, because I like to keep things cool and quiet.
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TJ Hooker

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What do you consider "a very small overclock"?

All GPUs will overclock differently, you probably just got unlucky. The only thing you can really do to get a higher overclock is increase voltage, but doing so increases heat and high voltage puts further stress on the card, potentially reducing its lifespan.
 
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Zaje23

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right now im running +8% power limit, core clock 1075MHz, Memory Clock 1592MHz
originally core clock 990MHz Memory Clock 1425MHz
 
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Zaje23

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how much would you recommend after adjusting the core voltage? as a first increment
 
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utroz

utroz

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Cooling is key, also some gpu's were already clocked near their max speed so you can't overclock them much. What exactly did you do when you tried to overclock? Just moving a slider for the clock speed doesn't work well at all for some cards, you have to adjust the power it is allowed to use and sometimes the core voltage as well, for VRAM it depends a lot on what RAM they used to make the card and the PHY in the gpu itself but voltage can help some as well. The biggest thing is cooling. If it is not cool then it will not want to run at faster speeds.
 
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TJ Hooker

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Are you stable at those frequencies? If so, I don't think that's a bad overclock, especially if you haven't touched the voltage.

You should be increasing the core and memory clocks separately if you aren't already. If I had to guess, based on results with my own R9 380, it's your memory clock giving you trouble. Are you able to increase your core clock any more if you leave you memory clock alone?

And as mentioned above, make sure to keep an eye on temps. You want to be <90, preferably not going higher than around 80 to be on the safe side.
 
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Zaje23

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yes im very stable at those settings, i cant increase the core clock much more maybe 6 pts but it becomes unstable at that point
 
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TJ Hooker

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Ok. Well, like I said, those clocks aren't anything to be ashamed of. If you do want to start increasing voltage, I would go with 5-10 mV increments, again keeping a close eye on temps. You can probably go ahead and increase power limit to the max, it won't really hurt anything (it doesn't automatically use more power, just allows the card to if it needs to).

But for myself, I found that when I had to start increasing voltage I ran into diminishing returns quite quickly. I got to 1100 core at stock voltage, and had to go up to +50 mV to get to 1150, and temps were rising dramatically. I ended up going with stock clocks and actually undervolting my GPU, because I like to keep things cool and quiet.
 
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Zaje23

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ok TYVM Officer xD last question, should i extend official overclocking limits to get a bit more? could this be holding me back?
 
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TJ Hooker

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I guess you could, but I don't think it would make a difference unless you're actually reaching the default limits, which doesn't seem to be the case. I don't think there's really anything "holding you back", I don't see anything to suggest that your GPU is under performing in any way.
 
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