setting a fixed clock on AMD?

[WARburton]

So im trying to under volt me 7800XT, but no matter when i do in MSI afterburner or the AMD drivers the card just boost's to what ever it wants..

if i set 2400Mhz and run a bench or game the card just boost's to 2550Mhz.
in turn if i try to under volt it crash's because the core just dose what ever it wants.

is there a way to set a max core/boost clock?

 

[NutritioN]

I take it you're using the AMD Adrenaline software? Leave at default except take the Power limit % down to -10 and apply. Does it still boost to max? And at what board power Watts?

 

[WARburton]

AMD Adrenaline software

hi buddy thanks for the reply, yes i used the AMD adrenaline software and also MSI after burner both gave the same results.
ill drop the power limit now and run a bench

 

[WARburton]

so yes.. running fire strike @4k with a -10% power offset it still hits 2513mhz BUT it dropped the hot spot by 9c so this could be the answer to my problem.
in games when there is more load the clocks should drop..??

obviously im going to have to have a Friday night beer and game all night (testing)

 

[ICDP]

As above confirms. On AMD 7 series GPUs undervolting power usage is only possible by reducing power limits. Adjusting voltage only helps reduce heat and this in turn increases boot clocks and will not reduce power consumption.

If you have a GPU that will undervolt well, that combined with a negative power limit will result in a GPU that can be as fast or faster than stock, but consume less power. If you simply set a negative power limit, you are also getting a slower GPU for lower consumption.

So undervolt and set a negative power limit for max efficiency. Or undervolt and set maximum power limits to get all out performance at the cost of reduced efficiency.

I hope this makes sense

 

[Tetras]

in games when there is more load the clocks should drop..?

If you set a lower power limit you would be capping the clocks, yes, though from what I've seen modern GPUs tend to bounce off the limiter rather than holding consistent frequencies.

Nowadays undervolting alone just means telling the CPU/GPU: "MOAR POWAR", 'cos you gave them a bigger envelope to push even higher frequencies.

 

[humbug]

You could also use Radeon Chill to given you an FPS range, it will keep your set minimum as best it can and never go over the highest you set.

 

[WARburton]

Thanks guys. So I’ve done a little testing and as you say I set -60mv and -10%.
In games it still hits 1450 / 1500 but runs a lot cooler so I’m a happy bunny.