What is PCIe? I notice on tigerdirect they put PCIe devices in the PCI category. I want to build a pc from scratch, but i am a bit behind in tech, so i don't know what PCIe is. So what is PCIe?

Please, don't litter BA with questions that can be answered on Google.
Also, you've never seen a PCI express x1 slot? Or even a x16 slot?

PCI-E port is mainly used for graphics cards and resource intensive extensions. The port has x1, x4, x8, x16 types of connection. x1 is the slowest, while x16 can be used for CPU-like power.

PCI port can also be used for graphics cards, but you won't get much performance. Mainly used for extensions like Ethernet, WiFi, etc. Has only one type of connection, which hasn't changed since 90s.

Someone correct me if I'm wrong.

thank you Pwned.

@soulman: I wouldn't have asked questions if i could find it on google.

ORLY?

Graphics uses x16 only. Enterprise RAID adapters generally use x8 lanes. Sound cards, cheap SATA controllers, USB cards and similar things use x1 lanes. Haven't seen much use for x4. PCI is just ancient now and has inferior bandwidth compared to PCI express.
you can find info like this on Google, I assure you.

not always i just look on the search results until i get to 3, because then they don't give what i wanted.

So you're incompetent to the point you don't read articles and bother us on BA? While we have a great knowledge on hardware, BA is not Tom's Hardware.
Now that I'm on my PC and not my Optimus 7, I shall point out your incompetence.
Oh wow, look what google found, an article! http://en.wikipedia.org/wiki/PCI_Express
More PCI express results! http://www.nvidia.com/page/pci_express.html
Holy crap, for something that shows no decent results, I got this: http://computer.howstuffworks.com/pci-express.htm
All on the first page!
viewtopic.php?t=24165 <- you really ask on a beta forum how to use reshack to customize an OS nobody but yourself will end up using?

No, anyways i am done asking questions for now (at least for awhile). I like this site a lot (not for asking questions) and i will donate (if only i could convert to US dollars) when i can.

EDIT: to above post, oh wow I can be a lazy person sometimes. Sorry about that.

EDIT2: Linux sucks man, also due to my disability i can't learn a programming language well. I've read the book on JavaScript so many times that i still don't know what i am supposed to do.

Wrong, graphics can use everything from 1x to 16x depending on the adapter and motherboard., Enterprise RAID adapters usually use 2x to 16x, depending on the adapter.

And PCI and PCI Express are two completely different standards, the only thing in common are three letters and that they are managed by the same group. PCIe is not an extension of PCI just as SATA is not an extension of ATA.

PCI is a 33Mhz, 32/64bit (64bit one called PCI-X) parallell bus. PCI cards can be used in PCI-X slots, but not the reverse except in some rare cases where you can either detach the extra connector or leave them unconnected (hardware support is needed).

PCIe is a 1 to 32bit serial bus. Cards of a lower lane standard (lanes are x1 to x16) can be used in a port of equal or higher lane, i.e a x4 card can be used in a x4 to x16 port for example. The reverse is possible in some rare cases, but very rarely used and needs actual hardware support. Not all full speed (x16) lanes run at full x16 speeds, that depends on the chipset of the motherboard.

And yes, you can find it very easily on Google, or rather on Wikipedia.

http://en.wikipedia.org/wiki/Conventional_PCI
http://en.wikipedia.org/wiki/PCI_Express

Actually, it's pretty widely supported - the only caveat being the limited bandwidth of lower lanes can be a bottleneck in some scenarios. You'd be hard pushed to find a graphics card these days that can't run at all in a 1x slot though, as long as the slot physically allows it (ie, it has the end open rather than sealed off, so the extra pins just hang out).

Indeed, my PhysX card (A GT430) quite happily runs in a 4x PCIe slot, despite being 16x.

you'll find I was generally referring to slot sizes, not bandwidths. Read again and you should spot this. Oh and my old p4 has an x16 card in an x16 length lane, however the chipset limits that to x4 on this particular board. Of course there are always exceptions but again, I refer to the general majority of add on boards, at least from what I've actually seen with my own and another's eyes.