So i bought a GTS 250 for a friend installed it and everything seems to be fine... And the guys that sold it to me told me that a 400w PSU wont be enough for it. And they said that the PSU will burn it self at the max load. But i installed it with the old i guess noname 400w psu. And i started to test it with the games he had Perfect World, LineAge 2 Gracia, Half Life 2 ep 2, XIII Century - Death or Glory, and other games (at max settings). Everything seems to work fine and with no issues... Will it make any sense buying a new PSU a better one or keep this one?