Yeah, please state what the age of your PSU is. FYI you're going to need at least 550W of power for the entire system with the RTX2080 populating the PCIe slot on your motherboard. The best that the PSU can deliver is probably between 350W-400W of power. Use at your own risk. I don't care about the Best Answer being awarded to someone else but I do care about dishing out the wrong information for the right situation.
You've been warned, use that PSU at your own risk.