Will gtx 750 ti or amd r7 260x work?

Solution
That's insanely poor PSU. http://www.akshatblog.com/odyssey-smps-450w-review-and-specifications/

GTX 750ti is the most efficient low-mid range GPU without needing a separate power supply and you need atleast 20A on the +12V rail for it. But, that SMPS of yours has only 10A. NOT RECOMMENDED TO USE ANY GPU. (Likely GPUs above Rs. 3000 or 4000)
That's insanely poor PSU. http://www.akshatblog.com/odyssey-smps-450w-review-and-specifications/

GTX 750ti is the most efficient low-mid range GPU without needing a separate power supply and you need atleast 20A on the +12V rail for it. But, that SMPS of yours has only 10A. NOT RECOMMENDED TO USE ANY GPU. (Likely GPUs above Rs. 3000 or 4000)
 
Solution