Agp, pci, pci-e

PCI is for things like wifi cards, soundcards and so on. AGP is for old graphics cards, PCI-E (x16) is for graphics cards. x1, x4 speeds can be used for soundcards/wifi cards and things.
 
PCI is for things like wifi cards, soundcards and so on. AGP is for old graphics cards, PCI-E (x16) is for graphics cards. x1, x4 speeds can be used for soundcards/wifi cards and things.

that isn't strictly true.

You can get PCI graphics cards, you can use a normal graphics card on any PCI slot so long as it can fit in, obviously it will be slower, but it will work

They are all 3 expansion slots, meaning you can put extra, non-essential components in, by which I mean they aren't needed to run the system, like graphics cards, NIC's, sound cards, RAID controllers, modems etc. They just use different layouts and support different things.

Linkin was right in that AGP is for older components, it is just about redundant now. PCI is generally for the expansion cards now, like your sound cards, wireless cards etc, and PCI-e is for graphics cards, but you can use a PCI-e card in a PCI slot and vice versa
 
In terms of graphics, PCI is the oldest and slowest, AGP was next, PCI-E x16 was after that, and now it's PCI-E x16 2.0. This is purely speaking of the interface itself, not of the video cards themselves.
 
PCI came first, and you can still get some graphics cards for it, though they're rather weak.

AGP came next, and was a video interface...it's gone now.

PCI express, or PCI-e for short, is the new standard. The number after it, like x16, x4, or x1, refers to how many lanes of data the slot has. You'll notice that this corresponds directly to how long the slot it.

An interesting thing about PCI-e is that none of the connections behind the little tab on the front are dedicated to anything. What this means is that you can plug a PCI-e card into any PCI-e slot that it will fit in, no matter the size. Some motherboard manufacturers even leave the back of the slot open, so that you can plug cards made for bigger slots into the smaller ones. It's strange, but it works. Sometimes video cards even work there.

An exception to that is video cards and the PCIe x16 2.0 slots. Often, these are for use only with video cards, though it's not unheard of for them to be available for other cards to use.

Here's some pictures to help:
expressguide1.jpg

pci-express-slots.gif


Here you can see the open-backed x4 and x1 slots that allow cards meant for larger slots to work:
AS890_slots.jpg
 
Last edited:
Back
Top