PCI, PCI-X, PCIe, and mini PCI.
PCI Express currently comes in four different slot sizes; the longest size (PCI Express x16) and the shortest size (PCI Express x1) There are also The accelerated Graphics Port (AGP) and also Industry Standard Architecture. (ISA) :-)
PCI is available in both 32-bit and 64-bit versions.
There are four types of graphics card available today: integrated,the AGP, the PCI, and PCI Express.
Conventional PCI now has four types of slots and six possible PCI card configurations to use these slots
Yes. The ASUS K8U-X has four PCI slots.
PCI, PCI-e, AGP
Some versions of HP Compaq dc5750 Business PCs have been equipped with A+G PCI WiFi adapter.
It can have several buses, including the system bus, the PCI Express bus, the PCI bus, the AGP bus, and the outdated ISA bus.
Unless it's a very old computer, your graphics card will be either PCIe (PCI Express) or AGP, and if it was bought within the last... Say, four and a half years, it will definitely be a PCIe setup for graphics with your other component cards running on a PCI bus. If it was a gaming computer sold post-2003ish it will also have a PCIe bus.
No, PCI Cards will not fit on PCI-E slots
No you can not plug a PCI card into a PCI-Express slot. PCI and PCI-Express slots are physically of different size and differ in connectivity. - Neeraj Sharma True, you cannot directly connect a PCI card to a PCI Express slot, partly because the physical slot design is different, but also because PCI and PCI Express handle data in completely different manners. There are however, adapters available that will enable you to connect a PCI card to a PCI Express slot through an interface that "translates" PCI signals to signals that PCI Express can read. They are available in single PCI to PCIe configurations, but those require a bit of extra space within the chassis if your computer. You need to make sure you have the required space available. There are also adapters available that include a PCIe card with a serial(?) port to which you connect a cable that attaches to an expansion box that accepts multiple PCI cards. One example can be found here: http://www.virtuavia.eu/shop/pci-express-to-pci-expansion-box-p29809.html Of course, you should remember that using one of these means you are pumping four PCI card's worth of information through a single PCIe slot. You need to do your homework before just randomly plugging four cards into an adapter like that. A combination of Firewire and USB cards may not be a problem, whereas combining video and sound cards could present problems. Due diligence is certainly called for! For a better understanding of my edit to this answer, you may want to read the discussion area.
Yes, a Radeon 9250 would work in that kind of motherboard. You can use both versions of it (PCI or AGP.