Personally, I don`t bother with trying to match the colour of my graphics card or anything else with the colour of the mobo.
Not if the case does not have a see through window. As long as all the parts work and play with each other then colour of the hardware does not matter.
But I understand how people want to make it look the best they can Antithetically eye catching as they can.
But if the case you have does not have a see through window on the side of your case I see no point at all.
To be fair.
So I presume you have a see through window on the case, and no doubt have also opted to fit Led lighting inside the case also. I dare say red is common for components.
But as for white I think I have only seen one white motherboard and a white Pcb on a graphics card.
Most as you know are black, red, blue or green, some even purple.
Think the main point is that it works and does what you want it to being practical about it.
But hey it`s your case and you have the choice on what to do and fit. As long as your happy that`s all that matters also.
The choice is your`s when it comes down to it PureFetus !.