u/Express_Anywhere_705

so I just got this PC with an msi rx6900xt gaming trio x. and the psu it came with is a seasonic 750W 80+bronze. when I started it, it was all fine till I ran Genshin. it restarted, so I tried undervolting coz I was thinking the power might not be enough causing the psu to trip. I got it to -10% power and 90% Voltage, I also put it on power saving mode. now it's even restarting even when just browsing on chrome (probably caused by the undervolt).

what can I do to fix this? what settings do I need to tweak to make it stable? or do I really need to replace the psu asap?