Dobrý den, ano, měl by být zpětně kompatibilní s PCIe 3.0:
"One thing that you do have to be aware of, however, is system compatibility. The Samsung 980 Pro is backwards-compatible with PCIe 3.0, which is good. However, the speed when you connect it to a PCIe 3.0 platform – like older AMD motherboards or current Intel ones – drops down to a theoretical 3,500MB/s for sequential reads. So, if you don't have a PCIe 4.0-compliant system, you're better off going with a cheaper PCIe 3.0 SSD that can reach the same speed."
Zdroj:
External Link
Upřímně zdejší specialisté se umí odkazovat pouze na IT, ale opravdu pomoci ne co, stačí asi 3 minuty googlení :)