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-   -   RX 480 voltage spikes under light load (https://www.overclock.net/forum/67-amd/1721170-rx-480-voltage-spikes-under-light-load.html)

Ph42oN 02-23-2019 01:53 AM

RX 480 voltage spikes under light load
 
I have my Asus Dual RX 480 overclocked to 1440mhz, cooled by cpu waterblock. Its at about 1.21v on load, but in light load where clockspeed is jumping around i see some voltage spikes in hwinfo, it says maximum voltage was about 1.42v. In gpu-z max voltage shows about 1.3v. I also did some testing with about 1.3v on load, hwinfo said max voltage was 1.5v.

Should i be worried about these spikes, and would it be safe to run higher than 1.21v?

BLUuuE 02-23-2019 03:19 PM

Quote:

Originally Posted by Ph42oN (Post 27865324)
I have my Asus Dual RX 480 overclocked to 1440mhz, cooled by cpu waterblock. Its at about 1.21v on load, but in light load where clockspeed is jumping around i see some voltage spikes in hwinfo, it says maximum voltage was about 1.42v. In gpu-z max voltage shows about 1.3v. I also did some testing with about 1.3v on load, hwinfo said max voltage was 1.5v.

Should i be worried about these spikes, and would it be safe to run higher than 1.21v?

If your 480 uses the IR3567B voltage controller, you can set the Vmax register, so you won't have those voltage spikes.

Ph42oN 03-05-2019 03:14 PM

I found about WattTool, and it seems that when using it to overclock, i get less aggressive LLC than Asus GPU Tweak i was previously using. With it, voltage spikes are gone in GPU-Z, but still appear in hwinfo.

Quote:

Originally Posted by BLUuuE (Post 27866106)
If your 480 uses the IR3567B voltage controller, you can set the Vmax register, so you won't have those voltage spikes.

I don't know what voltage controller there is, but at least its not what WattTool can control. Not going to take apart card soon, and didnt find anything when trying to look online.

mattliston 03-05-2019 04:08 PM

Look at your temperatures with hwinfo. do the gpu temps also spike with the voltage?


If not, likely the spikes are merely software being buggy and nothing to worry about


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