VRAM doesn't downclock with 2 high refresh rate monitors

[mahanddeem]

Hi,
I have an RTX 4090, and 2 OLED monitors, main display is Aorus 1440p 360hz@10bit, secondary is MSI 4k 240hz@10 bit, both use DSC, and both are connected to HDMI 2.1 cables and ports (my 4090 has 2 HDMI 2.1 ports).

Nvidia control panel is set at 1440p, 360hz, 10biit for the Aorus, and 4k, 240hz, 10bit for the MSI.

Using MSI afterburner, GPU-Z, and all other monitoring applications, it shows my VRAM clock is 1327mhz (full clock), no matter what is shown on the monitor, even at idle and at all times. I use complete black color background and no icons, enabled auto hide task bar.

Driver version as of today, just released October 1st 2024. 565.90.

Also high power consumption with 2 monitors active (likely related to the VRAM full clock).

When only one monitor is active (the other is at power saving, off, or disabled) VRAM clock on idle goes back to 50mhz.

Is that a bug? Nvidia should know about it? Any work around it?

 

[bug]

That's the most common issue when refresh rates don't match. GPU can't figure out when it will need to send data to the monitor next, so it runs VRAM full throttle, just in case.