- Posts: 6
- Joined: Sun Aug 25, 2013 9:03 pm
According to the PCIe standards, any 4.0 or 5.0 slot *should* be backwards compatible with older generation cards. Unfortunately, I don't have a PCIe 4.0 motherboard to specifically test this.
The only exceptions to this rule that I'm aware of are some very old PCIe 1.0 cards which initialize too slowly, and the CPU assumes there's no card present because it doesn't respond quickly enough (or so I'm told.)