How can I find out what graphics card slot I have without opening up my PC

Woody1999

Admirable
How old is your PC? If it's more than, let's say, 8 years old, there is a chance it will be using AGP. Any newer than that, it's bound to be PCI-E.

AGP was starting to be phased out when I was 5 years old, so I doubt if your motherboard still has one.

Woody