What is the purpose of an expansion slot on a motherboard?
Answers:
To add some feature that the motherboard doesn't have, or upgrade an existing one.
Things that might be added:
1. Wireless card
2. Video capture card
3. Winmodem
4. SCSI adapter (though unlikely)
5. RAID controller
Things that may be upgraded:
1. Video card
2. Ethernet card (to support Gigabit speeds)
3. Sound card
uhm.. to expand its use
Exactly what the name says. You can expand your system with new hardware, like a new graphics card or some other new peripheral.
If you decide you want to add an external device such as an external hard drive or an additional disc drive, it gives you a place to plug it in.
These slots are useful in adding peripheries to your system. For example you can add a sound card to your PCI expansion slot. You can also add a hard drive if you have a raid card installed in the PCI slot.
To add a modem, a sound card, another serial or parallel port, an additional controller card, a wireless antenna, anything with a PCI bus.
Used to add a user purchased piece of hardware. Depending on what kind of slot it is AGP/PCI/PCI-E, it could be for adding a Video card, Sound card, Network Interface card, Modem...
You can add things, such as video cards, sound cards, network cards, usb slots, etc.
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