Although all PCs come with display circuits built onto the motherboard, they are bypassed if a GPU card is plugged in. See chipset and graphics card. Take your pick... display adapter, graphics ...

We’ve seen lots of circuit board business cards before, but none quite like this. [Saar] calls it the Engineer’s Emergency Business Card. But wait — why are all the components in through holes?

[Joel] has a video of his screen that shows him pulling off in-circuit SD card reading and writing. You can check that out below.