Hardware & Technical How to underclock R9 280X?

I have an XFX R9 280X Black Edition and I do need to underclock it. I've tried latest Crimson and Catalyst drivers, but the built in overclock tool doesn't affect the actual clocks under load. The manual fan speed control does work though. After a bit of searching, I tried MSI Afterburner and that also doesn't budge the clocks. Any ideas? And yes, I did hit apply after setting the clocks.
 
When you say under load you mean the 3D clocks (i.e. gaming not desktop)?

If yes then Radeon Settings should let you do that. Have you tried changing the powerplay setting?

Another option is ASUS GPU Tweak, but with the exception of being able to set 2D clocks to always match the 3D clocks, it offers the same functionality (actually less) than Afterburner.
 
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You might be onto something there. I'm actually going to run it under compute conditions, so strictly not 3D. I'll see if I can find it and give that a try :)
 
Tried it... didn't help. I could set the 2D clocks with it and see it change, but as soon as the tasks fired up, the factory OC clocks came on. Neither 2D nor 3D settings changed that. I'm assuming it is hard wired into the card so giving up at this point.
 
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