New GPU Problem

Sep 6, 2018
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Hello.
I have trouble with my new PC.
I assembled it, launch it, launch the game (AC Origins) and performance was really low providing with like-crashing sound (It could disappear during the game). FPS Drops and low amount of it. I decided this is because of defective GPU and did the RMA. But after RMA here is the same problem. During RMA i was using it without GPU and it was working really good (For CPU graphic adapter). Updated BIOS, reinstalled drivers a lot off times, tried older versions it's not working.

System:
Motherboard: ASUS ROG STRIX Z370-I GAMING
GPU: EVGA GEFORCE GTX 1080TI SC BLACK EDITION
CPU: Intel Core-7 8700k
RAM: 16 gb by G.Skill (2 x 8)
PSU: CORSAIR SF600 (600 W)

have the same system with my friend (except of GPU (his gpu from asus but it is still 1080ti) and his RAM is 32 gb by G.SKill) and his system works fine