3070ti with x470 prime pro build

If you run the system with the 970, what are your voltages; specifically the 12V, 5V, and 3.3V rails?
You did not post the exact motherboard however I am assuming it is an asus prime pro. Go to the support page and download/install the asus suite. Note the suite has a lot of programs and the only one you need for this test is dual intelligent processors. You can install any others you want however that is the only one you need right now. Here is a link to the support page for what I think is your board;
PRIME X470-PRO｜Motherboards｜ASUS USA
Post screenshots of DIP showing the data. Do this twice. Once under a normal load and again while running a stress test. Use prime95 or realbench for the stress test. Let the stress test run for at least two min to stabilize temps/voltages.

Thanks, i'll try.

I don't think i will be able to, because with 3070 screen goes black minutes after windows loads

No, you need to run the tests with the working video card installed.

Ok, will post results, thanks

I think it is 12 pin and comes with an adapter

I believe it has 12 pins and a plug adaptor. Check it bro. I am saying this on the behalf of my experience.

Macboatmaster said:

I think it is 12 pin and comes with an adapter

Click to expand...

If it is a 12pin with the lower 4pins as in the pic, that is a BIG reason why it does not work. That new type of plug is designed for use with a smart pw supply ie atx 3.0. What it does is inform the card what type of pw supply is in use AND the card will limit it's use of pw accordingly. I have seen some of those adapters that use three pw connectors and some use four.

Only some of the 3xxx series cards have that plug and [AFAIK] all of the 4xxx series cards will come with a smart plug.