PCIe 4.0 SSDs are much faster
There’s still one compatibility question with these SSDs, though: PCIe 3.0 or PCIe 4.0? SSDs that use the older PCIe 3.0 standard will work with a wider range of systems, as newer motherboards with M.2 slots that support PCIe 4.0 will be backwards-compatible with 3.0 as well. Nonetheless, PCIe 4.0 SSDs are much faster, so it can be worth paying for them if you have the budget. You’ll just need to make sure that both your motherboard and CPU have PCIe 4.0 capability, which shouldn’t be unusual if they’re from the past couple of years.