it uses a PCIe BUS
serial
Serial
Usually a Graphics cards or some higher end sound cards will use this type of bus.
Peripheral Wrong dumbo, it is a SERIAL BUS
You cannot use a 2.0 pci express card in a pci express slot because the technology is newer. For example: It would be like putting a playstation 3 game into a playstation 2 console.
PCI
The slot which the video card needs to work. The slot is usually either an AGP slot (which is currently outdated), or the more recent PCI-E slot, which all new graphics cards nowadays use.
PCI-e card cannot be used on the 4600 motherboard.
both
A local bus is one which is integrated into the computer. Typically, this includes the Frontside Bus (or Hypertransport in AMD), the Memory Bus, the PCI bus, the PCI Express Bus (if present), the AGP Bus (if present), and onboard peripheral busses such as IDE, SATA, USB, IR, Firewire, and many others. Expansion buses are those which are not built in. For example, if you do not utilize onboard video, you would use a PCI, AGP, or PCI-E expansion bus to add video capabilities.
Yes you can use x16 PCI Express video cards on your D915GAV motherboard. I've the same motherboard & I'm using Nvidia GeForce 7300GT PCI Express. You can install all types of latest PCI Expresses on it. Here are the names of some great PCI Express graphics cards of Nvidia: Nvidia Geforce 9800GTX Nvidia Geforce 8800GTX Nvidia Geforce 7800GTX These PCI Express graphics Cards are great for playing games! I suggest you to buy Nvidia Geforce 8800GTX Nvidia Geforce 9800GTX is the greatest PCI Express but it is very costly. If your budget is limited then you can buy Nvidia Geforce 7800GTX Please dont try Nvidia Geforce 6 series PCI Express: it is very old. It supports DDR1 type RAM not DDR2 type RAM. Best of luck.
ExpressCard
The PCI bus is an unterminated bus using either 3.3V or 5V signaling voltages. Cards using PCI are keyed by slots in their edge connector to prevent plugging the card into a connector on a bus that expects signaling voltages that they are not compatible with.
PCI is used for many things like extra subport for your computer like if you have a PCI express card for Graphics, your computer will be able to use it and have better graphics for gaming or but there so many things you can put into a PCI slot but there are different sizes of PCI slot and they are: PCI X1 PCI X16 PCI Express which is all used for about everything if you have those you can make your computer awesome