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#11
Your PSU is 450W, and that card required minimum 400W. That is 50W different which will lead your system become unstable. As far as I know, GTX 750 > GT 740. Since your requirements is medium gaming and high resolution, GTX 750 will do fine until you have enough money to move on to big brothers such as GTX 1070, GTX 1080, or GTX 980TI.