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PCI, PCI-X, PCI Express - Oh boy

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Hardware

Lately I bought an old pc to use as a server and needed a network card for it. I didn’t think it be such a hassle but because of multiple PCI specs finding a card wasn’t easy. Theres been alot of confusion about pci cards and what card to get for your computer - PCI cards come in alot of different types and versions. I’ve done a good amount of research on this (if there are any discrepancies, please let me know) and hopefully this post will help clear things up.

PCI

Standard PCI cards (sometimes called pci 1.0) have a 32 bit width slot, and operate at 33 MHz. Originally they started as 5 volt cards but 3.3 volt cards began to be made that use a different slot.
PCI 2.1 came a few years later that added the Universal PCI card spec that allowed cards to be used in both 3.3 and 5v slots, and upped the bus to 66 MHz. Also they created a pci 64 bit width slot for high end cards (gigabit networking,…). This meant that there could be one of 4 different slots in your computer:

rest here




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