Chris, you're onto something. I was looking through the higher power stock bioses by Powercolor and Sapphie RX480s.
They all keep TDP(w) at 110.
The TDC (A) is usually around 82-84% of the
max power limit
Stock 110 107 110
one was 110
I'm an electrician (technical side), so I know there is a good correlation.
Watts is Volts X Amps if we ignore inductance/capacitance.
So, let's say your stock card was set up as 110w/107a . They are figuring you are running the stock voltages, which are lower.
But let's say you increase voltage from 1.1 to 1.2v, that is a 10% increase in voltage, meaning 10% increase in current.
BUT, wattage goes up 1.1 x 1.1= 1.21 or 20% if both current and wattage are allowed to increase.
So, if we had settings of 150A and 150 W
1.0v X 150A is 150W, under/equal TDP.. ok
1.2v X 150A is 180W, TDP passed- card maybe confused or throttles down badly (lower states use lower volts)
So if it wanted to equalize properly, It could do 2 things (not sure what it does):
-Drop the clock/vcore to a lower state, lets say 1.0v and 1050 mhz. 1.0v, keep 150A limit, get 150watts.
-Drop the watts but keep the 1.2v vcore state (lets say 1300mhz), this is where you get throttling.... But
It's actually better and more efficient to do 150W at the 1.0v@1050, getting more processing done
than to do 150W at the 1.2v@1300, because the 1300 state is hitting the limit, making the GPU "pause" like an idle state.
I know this because I was messing with powertune using OCCT, the best stress torture test... that test will show you if your settings are real or just benchmark queens
It will tell you if there are calculation errors!!! No more stupid reliance on looking for artifacts. Sometimes you can have many errors but have no artifacts!
OCCT Link: http://www.ocbase.comhttp://www.ocbase.com
I use 640x480, directX11, error check ON, shader complexity 7, FPS limit 0 (which will make you throttle).
If you want less throttling to test higher states, set a fps limit. For example I use 500 to get around my peak states to test typical gameplay (1.15@1235 and 1.175@1275)
Look at hwinfo64 and see how much juice you can pump, heat goes through the roof, but if you get the PT numbers right and the PT% right, you will have the card set up to never crash on OCP (overcurrent protection)Edited by robnitro - 2/14/17 at 2:08pm