Pcie lanes bottleneck

[Kimrenea]

Hey. I was wondering if a system can be bottlenecked by having too few pcie lanes available from CPU. Say you want to have two high end graphics cards running in SLI and Multiple M2 slots etc.

 

Take Intel's i7 8700K for example, who has 16 Lanes and i want to have 2 cards in SLI making them run at x8 and then add multiple M2's. Does that bottleneck the whole system?

 

I'm sorry for bad English.It is not my native language.

 

Feel free to change the location of my topic if it is in the wrong thread.

[Jurrunio]

PCIe 3.0 x8 is enough for a single graphics card with no performance loss

https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/24.html

 

SSDs in M.2 slots connect to the CPU through the chipset, sharing the 4 lanes there. Not the fastest way to do so, but that's how it works on general consumer platform.

[Kimrenea]

18 hours ago, Jurrunio said:

PCIe 3.0 x8 is enough for a single graphics card with no performance loss

https://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080_PCI_Express_Scaling/24.html

 

SSDs in M.2 slots connect to the CPU through the chipset, sharing the 4 lanes there. Not the fastest way to do so, but that's how it works on general consumer platform.

Does this mean that SLI, which requires 8 lanes per card, will not work properly with M.2 drives at the same time?
When will one actually end up "running out" of PCIe lanes?