Question Dual 1080ti make win10 very unstable and not responsive

[RichardBao1993]

Hi guys, I got some problems with my set up.
I have 2 Asus Rog Strix 1080ti, I have tested them on my pc and they work good. and also test in 3d mark, give me 10000+ score, and everything works perfectly, but when I stack them together, the win 10 system became very laggy, not responsive, and frequently black screen(recover in few seconds, sometimes I need to turn off and turn on my screen to make it work) Chrome not responding frequently, when I do some rendering, it gets worse, software not responding and crash frequently. I don't know what's the cause, I used Nvidia Experience download studio driver(always keep the latest driver), I also try game driver, not working as well. And my mouse frequently not responding when I use dual GPU. I have no idea. this is frustrating.
I test my GPU individually today and the system performed well.
It could not be a power issue since I am using a good 1000w PSU.
The rendering program I am using is Blender.
CPU: AMD 3900X
anyone who has tips or suggestions, please help me out!

 

[Ketchup79]

What do you mean by stack? Are you doing SLI? Blender doesn't do SLI (simple way of putting it).

 

[RichardBao1993]

What do you mean by stack? Are you doing SLI? Blender doesn't do SLI (simple way of putting it).

Not SLI, i just put them together.
I think ihad found the issue already, it may be caused by the Logitech options software that had some conflict with the system.