If Seasonic is not available in your country, you should look at SuperFlower PSUs. They're quite reliable and one of the best in consumer PSU business. (ps I have a 12 yo Seasonic Platinum PSU in my rig.)
at 1440p it's pretty good I must say. this card has all the latest goodies sans frame gen. have sufficient VRAM for its size too. If I'd look for a cheap upgrade from a polaris card or GTX 1060 this would be in my list.