Man, if it were me, I'd probably bit the bullet and bought a new motherboard instead of returning the processor. With my luck, I'll probably run into some issues with the ram sticks and bought some new ones. Heck, maybe I'll run into some issues with the old gpu and buy a new one too! Then the psu would probably need to be upgraded to power the new gpu. The temperature would probably kinda hot so the case must be replaced with new one with better cooling. Heck, now the monitor is too shitty for the hardware and need to be replaced with a new one with hdr and high refresh rate. Then the mouse would suddenly died and need to buy a new one too.