PCI-X is the upgraded version of PCI. It differs in the fact that the PCI-X bus is 64-bits wide, and runs at higher frequencies of up to 533MHz, compared to PCI frequency that runs up to 66MHz.
PCI-Express, on the other hand, uses a serial interconnect along a switched bus dedicated exclusively to that slot. PCI-Express has the unique capability of multiplying up individual data lanes, to produce aggregate interconnects that can deliver up to 16 times the bandwidth of a single lane.
PCI-X is backward-compatible with PCI but not vice versa. The PCI-Express slot, on the other hand, is no compatible with either PCI or PCI-X.
As you can see in the below picture, PCI-X is an extension of the 32-bit PCI slot. The voltage is the same (3.3V or 5V), and a PCI card can be inserted into a PCI-X slot, although it will of course only operate at a bandwidth of 32 bits, and at the PCI frequency.
An ExpressCard is an interface to allow peripheral devices to be connected to a computer, usually a laptop computer. ExpressCards is a hardware standard replacing PC cards or PCMCIA cards.
CardBus is the latest enhancement to the PCMCIA 5.0 or later. PMCIA stands for Asociación Internacional de Tarjetas de Memoria. CardBus was introduced in 1995 and present in laptops from late 1997 onward. The main purpose of CardBus was to extend the existing PCMCIA bus to allow more powerful devices, and also provide support for 32 Bit I/O.
PCMCIA is the short for Personal Computer Memory Card International Association. It is pronounced as separate letters. PCMCIA is also known as PC Card.
PCMCIA was originally designed for adding memory to portable computers, the PCMCIA standard has been expanded several times and is now suitable for many types of devices
The primary advantage of AGP over PCI is that it provides a dedicated pathway between the slot and the processor rather than sharing the PCI bus. In addition to a lack of contention for the bus, the point-to-point connection allows for higher clock speeds.
AGP Pro was launched in 1998 as an AGP interface extension specification for advanced workstations. AGP Pro bus is a specification that provides a direct connection between the graphics adapter and memory.
ISA is an old technology that has been replaced by PCI, PCIe and so on. ISA slots are usually black, long and the gold contacts are large.
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