Yes first you want to download the latest driver.
Then if you wish to stress your GPU, I'd download Unigine Heaven and/or Valley. Run these at max settings for your monitor. If this runs well, then you can be relatively certain your GPU is OK.
Then if you wish to stress your PSU, download a non-AVX version of Prime95 (
Prime95 26.6)) and run it at the same time as either Heaven or Valley. Use small FFT's for Prime 95. This will stress both the CPU and GPU in your system and provide a "max" load for your PSU. If this runs fine for an hour, then your PSU should be able to handle your system.