what's the difference between PCI and PCI express?

what's the difference between PCI and PCI express?

PCI is an infirm slot and bus, produced by intel in the pentium 1 era or around

the PCI bus be a 32 bit 33Mhz "Highway" where background travels. 32 bits means that 32 cars can travel one beside the other and 33Mhz would be the max speed of that Highway.

Doing some maths:

32 bit are 4 bytes ("user" is a 4 bytes word)

33Mhz mechanism 33 million times a second.

So in conclusion, 4 bytes x 33 Million is the amount of notes per seconds that can travel through the PCI bus, approaching 133Megabytes per second. That was seriously, compared to the even older ISA slot.



Then come the AGP bus and slot, physically different to the PCI slot, and faster and faster, it reached a rate of 2 gigabyte of information per second (that the AGP 8X one), perfect for video cards which really desires that fast highway



PCI express is the innate evolution, that is replacing both PCI and AGP bus and slot (PCI is still used today for small expansions boards, as 133MB per second are adequate for a modem, an USB port, a sound card, etc)



The rate of the PCI express will depend on the flavor. We Have PCI express 1x, 2x, 4x, 8x, and 16x. they are physically different, but pin compatible, objective that a 1X slot is a really small slot, but you can insert a 1X card into a 4X slot without problem. Not one and the same luck in the other method. You can't insert a 16X video card into a 4X slot due to its size of course.
PCI is an matured expansion slot, that today takes the nouns cards, network cards etc.



The PCI-E slot today is primarily the new expansion slot for Graphics cards.
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