[Sifao HD]

thanks for info gpu is gddr5 not3 and i can still play 1080p gaming with 30 fps overclocked it to runs 1440 mhz core clock mem 3370 mhz just cant undervolt or add volt

How do you reach that frequency?? I have the same card on a Dell Inspiron 7559 and I can't go past +135mhz.
For voltage mod: if you use MSI Afterburner to oc, you can activate Unofficial Overclocking mode that consent to modify voltage.