Kaveri throttling CPU under heavy iGPU load

[DrMrLordX]

Much ado about Kaveri throttling when the iGPU is stressed. Apparently it runs at 3 ghz under these conditions which has something to do with the p5 state. There is a hack to get around it, but it would be nice to know how to circumvent the problem in the UEFI entirely and to know which boards have the requisite UEFI options to accomplish such a feat.

Anyone out there know more about this issue? Also, are there any reliable ways to get the NB speed above 2 ghz? Thanks!

 

[Ventanni]

Issue? Isn't that how it's supposed to work? Those are very beefy GPU's on the Kaveri processors. It's no surprise they soak up most of the 100w TDP limit when running full load.

 

[Vesku]

Yes, that's how it's supposed to work. Doesn't mean that a list of motherboards that let you set a much higher throttling point in the UEFI wouldn't be useful.

 

[Centauri]

It's supposed to work that way? Since when? None of the prior generations of APU throttled at IGP load.

 

[Enigmoid]

Yep, its part of the reason why power consumption for prime + furmark tests dropped considerably. TDP may have dropped but until you look at the clocks you can't tell if efficiency is up.

a10-6800k minimally throttles (if anything). A10-7850k will throttle much more significantly.

Not sure how low power richland fares but i'm pretty sure it throttles as well.

 

[DrMrLordX]

Issue? Isn't that how it's supposed to work? Those are very beefy GPU's on the Kaveri processors. It's no surprise they soak up most of the 100w TDP limit when running full load.

If you're an HTPC user (for example), sure, throttling might make sense. Thermals matter in such circumstances. An overclocker probably doesn't want throttling during an application where CPU and iGPU performance are needed simultaneously.

Yes, that's how it's supposed to work. Doesn't mean that a list of motherboards that let you set a much higher throttling point in the UEFI wouldn't be useful.

Exactly!