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www.tomshardware.com/reviews/amd-crossfire-nvidia-sli-multi-gpu,2678-5.html

The Difference Between PCIe x8 And x16. A motherboard doesn't always come with two fully-featured PCI Express x16 slots. Available PCI Express lanes are often distributed across two slots, meaning ...

www.gamersnexus.net/guides/2488-pci-e-3-x8-vs-x16-performance-impact-on-gpus

For our test, we're looking at PCI-e Gen3 x8 vs. PCI-e Gen3 x16 performance. That means there's a 66.7% difference in bandwidth available between the two, or a 100% increase from x8 to x16.

arstechnica.com/civis/viewtopic.php?t=1426263

PCI-E 8 vs 16, or, "Am I an Idiot?" ... which calls for "PCI Express 2 ... and for most systems two videocards means two slots running in x8 mode since socket 115x only provides 16 or 20 PCIe ...

duropc.com/the-difference-between-pcie-x1-x4-x8-x16-and-x32

The number of lanes are indicated by the suffix of the PCIe protocol (×1, ×4, ×8, ×16, ×32). Each lane is capable of speeds from 250-1969 MB/s, depending on the version of the PCIe protocol (v1.x, v2.x, v3.0, v4.0). PCIe cards can always operate in PCIe slots with the same or more lanes than the card.

www.techspot.com/community/topics/pcie-x-1-4-8-16-compatiblity.93434

PCIe x(1,4,8,16) compatiblity. ... While a 16 lane card cannot be used in an 8 lane slot it can be used in a 16 lane slot with only 8 ... I'm no expert on the technical details of pci express, but ...

www.pugetsystems.com/labs/articles/Titan-X-Performance-PCI-E-3-0-x8-vs-x16-851

A number of years ago, we published the article "Impact of PCI-E Speed on Gaming Performance" investigating whether you would see a difference between a video card in a PCI-E 3.0 x8 slot versus one in a x16 slot.At the time, we found that even the fastest video card available had nearly identical performance whether it was running at x8 or x16.

en.wikipedia.org/wiki/PCI_Express

PCI Express devices communicate via a logical connection called an interconnect or link.A link is a point-to-point communication channel between two PCI Express ports allowing both of them to send and receive ordinary PCI requests (configuration, I/O or memory read/write) and interrupts (INTx, MSI or MSI-X).At the physical level, a link is composed of one or more lanes.

www.techpowerup.com/review/nvidia-geforce-rtx-2080-ti-pci-express-scaling

In this review, we are taking the fastest graphics card from NVIDIA, the GeForce RTX 2080 Ti Founders Edition, and test it across PCI-Express 3.0 x16 (the most common configuration for single-GPU builds), PCI-Express 3.0 x8 (bandwidth comparable to PCI-Express 2.0 x16), PCI-Express 3.0 x4 (comparable to PCI-Express 2.0 x8), and for purely academic reasons, PCI-Express 2.0 x4 (what would happen ...