PCI-E audio means that there is a separate sound card in a PCI Express port instead of on the motherboard. These generally offer better performance than those built into the board but usually cost more
X1 means 1 lane, X16 means 16 lane, hence has 16 times bandwidth. Each lane is differential signal.
connector
yes it does
pci express (PCIe)
New cards that support PCIe 2.0 are backward compatible with PCIe 1.1, thus you can install latest PCIe 2.0 cards on x16 PCIe slot of current or older motherboards. Latest PCIe 2.0 standards offer double the bandwidth of current PCIe 1.1 standards. The majority of single graphics cards are yet fast enough to fully take advantage of the wider bandwidth of PCIe 2.0. It is the multi-GPU or the multi-card set up that benefit most from PCIe 2.0. PCIe 2.0 and PCIe 1.1 use the x16 PCIe slot format but the PCIe 2.0 slot is capable of sustaining 150 watts while the PCIe 1.1 slot is only capable of 75 watts max. PCIe 3.0 is electrically compatible with previous generations but uses a different encoding scheme to increase the throughput.
A person should install a PCIe network adapter in the PCIe network slot on a pc. The PCIE network adapter allows the PC the ability to connect with the Internet.
PCIe Version 1.1 and PCIe Version 1 have the same throughput.
Audio MEANS hearing.
When you insert a PCI Express 3.0 card into a PCI Express 2.0 slot, the card will still function, but it will operate at the lower speed of PCIe 2.0. This means it will have reduced bandwidth compared to its capability in a PCIe 3.0 slot. However, the compatibility is maintained because PCIe is designed to be backward compatible. Overall, while the card will work, you won't benefit from the higher speeds that PCIe 3.0 offers.
I presume that you mean to ask whether a PCIe 3.0 card can be used in a PCIe 2.0 slot on your motherboard. The answer to that question is yes. PCIe standards are all backward-compatible, so do not sweat that. For best performance, however, you would prefer to put a PCIe 3.0 card in the same type of slot.
audio is something you hear, visual is something you see.
Audio is Latin and means "to hear" in English.