Managed to OC my 5870 to 945/1300 on stock volts, it's perfectly stable on MSI Kombustor and FFXIV but it crashes on youtube or any other streaming sites.
I made 2 profiles with afterburner, one for 2d (stock) and other for 3d (OC), but looks like youtube makes the card go 3d mode.
I've also noticed the card will no longer idle (unless I do the 2d - 3d profile thing) and while I'm on youtube the card runs at 400/900 instead of 157/300 (idle), this doesnt happen when OC'd, it will run at full speed.
I've found a work around keybinding the OC profile and only activating it when I'm going to play, but it's kind of anoying, is there a way to make the OC profile activate only when running certain apps?
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