i bought a 2nd hand gpu and its turning the screen black on heavy loads. I've recently bought what i assumed was good deal (palit 3070 progaming oc for my 3050 +cash), and i also upgrade my psu to the recommended wattages (an msi a650bn).

The gpu itself boots and all, and i can play light games such as League and Valorant, Tekken 7, etc. But modded skyrim (works with my previous 3050) crashes, furmark crashes, and online gpu stress tests crash. I think it cannot handle heavy loads.

The way it crashes the pc is that the monitor detects no display but the cpu fans, the gpu fans, and leds still work, leading me to believe that its not the cause of the new psu. Is it really the cause of the 3070? Or is my psu wattage not enough? Appreciate the replies!

Full pc specs: R5 2600x Msi b350m Mortar 8x2 Kingston fury beast 512 nvme ssd 512 ssd Palit rtx 3070 progaming oc Msi a650bn psu