Review - AMD Radeon R9 290X

[magnum]

You need to tweak powertune, fan and clock settings so the card doesn't throttle (otherwise it does so even when not hot at all). Specifically, the trick is to have the hardware switch in "über" mode and set min clock == max clock.

If you're on Linux, try eg. https://github.com/epixoip/od6config

Having done that you can also OC the card to 1100/1350 or so, with no problems.

Edit: I see now you did use the od6config tool, so my bet is you did not flick that switch on the card. It needs to be set "away from the rear".

Edit2: If the card still throttles despite everything done right, it really gets too hot (>94C) and you should be thankful it saves itself by throttling. Fix cooling if this happens.