So I have a prebuilt PC that cost me like £400 two years ago. I'm giving it to my brother as I'm getting a new rig with a GTX 970. The PC can't run games like ARMA 3 and BATTLEFIELD 4 well and my brother wants to play those games. Currently it only has a AMD A6-6400K APU with intergrated graphics. If I upgraded to a new APU (so i dont need a new MoBo) that is quad core and then disable the intergrated graphics and add a gtx 750ti will it run thesae games at low-medium settings? Also the PSU is only 230v so will that be able to power the upgrades along with the existing 1tb hard disk and 8 gigs of ram? Thank you so much for any help!