PCI Express standard requires all PCI-Ex16 slots to provide up to 75 watts of power. Power isn't the issue here. Some GTX 1050 Tis require the UEFI BIOS in order to run and your motherboard does not have it (nor can it get it).
Verify that the card you're looking at does not require UEFI BIOS before making the purchase.
Honestly, though, I wouldn't bother. Time to start thinking more about upgrading the rest of your system.
-Wolf sends