Nvme via pci adapter and video card?

Question

Solid State Drives

Totally confused about pci lines and ssd connection.
1 If we take a motherboard, for example, z390 for Intel, the specifications directly say 16 lines for video and +4 +4 lines from the chipset for 2 nvme drives. We insert a video card and 2 ssd = everything works together at their speeds, right?
2 Now the case is more interesting. Motherboard Asus z97-k. It has an m2 connector, but the specs indicate the operating modes sata OR (!!!) pci. And that's it. Not a word about the lines from the chipset, only the speed of 10 Gb / s is indicated. Strange speed, where does it come from and what will happen with a video card connected? And what kind of sata mode is 6 GB from the chipset? Meaning then m2 connector...
3 Let's say we have a 1155 motherboard, let it be b75 and 3770. I connect the nvme drive through a pci adapter. What will happen to the lines? If there is only one port on the mother 1x16, then we insert the adapter into 1x4? How will she share the lines with the video card? And if the mother z77 is under crossfire and she has 2x16 - does it matter? Is there a mode of operation in which the video card remains in 16 lanes when the ssd is running?
4 And then I thought. I often saw pci zvukovuhi and network adapters. How do they use the lines and how many lines does the video card have? Insert sound and video 1x8?
Is there any way not to get confused in this and correctly connect pci ssd on different motherboards?

Answer 1

It all depends on the specific mat. fees.

Meaning then m2 connector...

And what's the point of having molex, usb, or hdmi connectors?
The m2 connector has exactly the same meaning - so that devices with such a connector can be connected there.
Usually this connector is used to connect various kinds of drives and WiFi adapters.

Answer 2

Something of a mess of questions.
And everything is solved in an elementary way - just read Wikipedia articles (for starters) on such things:
m.2, pci-express, nvme, ssd, sata.
And more specifications of motherboards and (!) Processors of interest. See how many pci-ex lines are in a particular motherboard, and what it generally supports. There are also nuances for ssd m.2 - there are different keys on m.2, and even with one ssd key it can work either via nvme (pci-ex) or via sata in the same connector (yes, again, if it is provided there board manufacturer).