OEM - Original Equipment Manufacturer
A manufacturer that resells another company's product under their own name and branding. Acer, Dell, HP, ..., etc. are OEMs because they assemble their systems using other manufacturers components under their own brand name.
The GeForce GTX 745 wasn't a retail market card. It was made specifically for OEM companies like Acer, Dell, HP, ..., etc. There is no guaranteed compatibility with any other system other than the system in which the card was originally sold with. It seems that there is something missing in that OEM graphics card's VBIOS that makes it incompatible with your motherboard.
The GeForce GT 220 and the GeForce GT 1030 were available on the retail market where...