Because managing PCI Express lanes in a PC is no small task.
In a PC, you can connect various PCI Express expansion cards, as well as SSDs via M.2 ports and numerous peripherals via USB ports. There are a few other options as well, but these three scenarios form the foundation of any machine. However, beyond just the connectors available in your machine, you may be limited by what are known as PCI Express lanes. These lanes—both physical and logical—aren’t directly visible, and to understand the machine’s actual capabilities, you often have to delve into the motherboard and processor documentation. Unfortunately, manufacturers don’t make this easy for us, as they generally highlight only the most generous specifications.
The interface is simple and very clear. © PCIe Lane Simulator
Keep in mind, however, that even if you have two PCI Express x16 ports—the largest formats—in your system, this doesn’t mean you’ll be able to take full advantage of both ports’ potential. The first, usually dedicated to the graphics card, will take priority and will most often leave only a few lanes for the second, which will then run as fast as a “mere” x4 slot. The same applies to SSDs: even if your motherboard has two, three, or four M.2 ports, that doesn’t mean all connected SSDs will be able to operate at their maximum capacity: the first will often be PCI Express Gen 5, while the others may be limited to PCI Express Gen 4 or even Gen 3.
Detecting some “limitations” in the configuration. © PCIe Lane Simulator
To help us make sense of it all, a developer has created the PCIe Lane Simulator. It’s a very simple website that lists a vast number of components, allowing you to simulate your setup to see if everything is performing at its full potential. You can also use it before purchasing components to ensure everything will perform optimally. The interface—as streamlined as possible—is very easy to use, but for everything to work optimally, it’s essential to have the exact part numbers for all relevant components. It’s so convenient that you have to wonder why no one thought of it sooner!
