Originally Posted by mynm
Hi, I have a problem with Afterburner and OverdriveNTool, changing the core clock, the voltage is droped fron 1.206v to 1.15v, like you can see in this video:
Do anybody with an 590 or other polaris gpu see this?.
I think that the problem is that Afterburner and overdriveNTool are not using auto voltages like wattman. It seems that they are using manual voltages. Increasin the clock with wattman and voltage in auto, I don't have the problem. But if I have wattman activated, I see that sometimes the max memory clock is droped fron 2000mhz to 1750mhz, and it can cause instability, so I don't have it activated. I'm using the 126.96.36.199 drivers.
I have found one way to solve the problem, is to change into ASIC Profiling table, ulEvvDefaultVdcc and ulEvvNoCalcVddc form 1.150v to 1.206v that is the highest value I see in dpm3. Also I have tested to change ulEfuseMin from 1200 to 1550 to lower the dmp 6 to 3 voltages, but voltages are to low. I have to test a value between 1500 and 1550, because with 1500 dpm 6 is 1.206v.
Afaik with my tests, those voltages are the manual voltages you can see in wattman and OverdriveNTool, and are a fixed voltages for per dpm clock. They are used if you are changing core clocks in Aferburner, trixx, OverdriveNTool, and wattman with manual voltages.
Changing clocks with auto voltages in wattman, or with a registry value in OverdriveNToo,l it is using the stock auto voltages, that can be increased or decreased changing the clocks.
Other thing I see is that if you are using OverdriveNTool without Wattman activated, and you change some value on it, a registry value is added and the manual voltages are used instead the auto voltage ones, so it can cause problems.
To increase or decrease auto voltages, that is a range of voltages per dpm clock. The easy way is to use a voltage offset with AB of Trixx. But there is a second way using some values into the powerplay named ucCKSVOffsetandDisable. It seems that increasing the value by a 6 dec value is incresing the voltage 6mv and decreasing it is dreceasing the voltage. I don't have tested negative values for it, I have tested only up to 00.
480s and 580s have these vales to 00 and I don't know if this is working for them.
You can see the location of these values in the second image. I don't have tested DPM 0 ucCKSVOffsetandDisable that is 80, but it seem it is not increasing the voltage.