Unfortunately Dell has become highly proprietary as you can see from the V3268 motherboard form factor. This board can not fit any standard case.  ATX psu will have to be completely outside Dell case.A standard SFX psu may be installed partially outside Dell OEM case.  What I mean by this is you would not be able to close case side panel after you put a standard psu in the Dell case.  SFX psu is taller than TFX psu. [IMAGE]  
Hello guys! My name is Brendon and I have a Dell Vostro 3268 computer and I'm looking to upgrade.I've already got more memory and an SSD and I'm thinking about getting a video card like a GTX 750 TI 4GB that holds what I want at the moment, however I would like to put a 600 or 650W REAL 80 plus power supply for a future card upgrade of video. My motherboard is a 0Y2YM6 with 6p + 4p connectors. I am very doubtful which power source to buy, since most connectors are 8+6. Do you have any recommendations for the power supply or would you know if I can use adapters to connect the power supply to the motherboard? PS: the size of the bag is not a problem, as I plan to change it too. Thanks advance! 
Power Supply to Dell Vostro 3268 which video card GTX 750 TI 4GB