Yes I'm using a adaptor amd playing at 1366*768 monitors and mostly stutter in rise of the tomb raider and assassin creed unity .I can return psu I bought it new one.
I have two options of psu one is vip 500w with 18amps it two has dual rail .and antec bp 450s and antec bp 450ps both has 8 pin connector . All other psu here way out price for ex Corsair 450w is 3000rs with single rail .