The PCI-E X1 slot is just a really small (about 3cm long) slot used for expansions. It is much better than PCI because it has a much larger bandwidth, but you can make smaller expansion cards with better stuff than PCI. I have a TV tuner that uses the PCI-E X1 slot.
Read up on PCI-E here, its pretty interesting: http://en.wikipedia.org/wiki/PCI_Express
On a personal note, the slots are a b***h to work with because they are so small. Especially with smaller cases and when all other expansion slots are full.
i never knew that it was an upgrade of a pci, what can you put in the pci-E X1 slot?
network cards, usb cards etc. Wouldn't be surprised if you would find a sound card that uses pci-e 1x.
Basically it's ment for small stuff, kind of like pci is used nowadays.
What can you put in a PCI-E slot? Just about anything (as long as it matches the slot form factor)
PCI-E x16 is mostly used for graphics cards. All of the modern day GPUs use this slot, such at the nVidia 8xxx and 9xxx series, as well as the ATi 3xxx series.
PCI-E x1 is pretty much the replacement standard of PCI.
Good examples of PCI-E x1 cards:
TV Tuners: http://www.newegg.com/Product/Produ...222+1148610224+1148418886&name=PCI-Express+x1
Sound Cards: http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&N=2010360057+1102631935&name=PCI+Express
RAID Controllers: http://www.newegg.com/Product/Produ...150410+1193216733+1193515356&name=PCI+Express