You'll need min 400W for the GTX750 that could mean up the PSU from 300 to 400W.
Don't think you can buy a GTX745, it's a dedicated low power consumption OEM card made for PC manufacturers I think.
Fujitsu Lifebook P727 laptop review
Microsoft Paint set to die after 32 years
Mac power user tips and hidden tricks
Comment désactiver la saisie intuitive et paramétrer votre clavier ?