How do i tell what my card is

[AMD6415]

My parents have a Dell 4600 and i was going to change the video card on it and I don't know how to tell if it is a AGP or a PCI or what it is can someone tell me how I can look to see what it is
don't laugh at me i am new to computers and only know the basics

 

[Nitestick]

well an agp slot will be set slightly further back than other slots and will most likely be brown. a pci-e slot is tha narrowest and a pci slot is the one that doesn't fit either of those descriptions.

 

[AMD6415]

Well i looked at it and it is further back than the other slots but it isn't brown it is green

 

[Kitire]

That is teh AGP.

 

[The_Tobes99]

the newer motherboards are breaking away from the brown slot, my GAK8NSC-939 has a green agp slot