PCIe 4.0 delivers up to twice the bandwidth of existing PCIe 3.0 SSDs, and is set to become the de facto storage standard for PCs going forward.
As a result, it’s still early days for PCIe 4.0 on PC, and it likely won’t be until Intel’s next generation of 11th Gen Rocket Lake CPUs that we’ll see a full PCIe 4.0 ecosystem available.
At the moment, only AMD’s X570 and B550 motherboard chipsets have full PCIe 4.0 support, as Intel pulled it from their new 10th Gen Comet Lake CPUs shortly before launch, even though some of their Z490 boards do technically support it.