Graphic card is not supported on T150. Not supported does not mean it will not work. As it is not supported it is not validated, hence we can not guarantee that it will work. You can also wait for another Community member who tried this combination and share their experience. You can refer below link for list of cards supported on T150 [URL] 
I intend l buy Power edge T150 with preinstall PERC H350. Will it be possible to install later graphic card that requires  PCIe x16 link in x16 slot (e.g. System board  Slot 2) ?
Power edge T150 with preinstall PERC H350