can you use a pci 3.0 card in a 4.0 slot
What is PCI Express? Do PCIe lanes, slots, and versions matter?
While you can install any PCI Express card in any size PCI Express slot, you should match the type of card with the type of slot, for example by installing a PCI Express x8 card in a PCI Express x8 slot.
Will this card work in a PCI-E 3.0 slot? – Q&A – Best Buy
A PCIe 3.0 GPU card connected to a PCIe 4.0 (or, in the future, a PCIe 5.0) slot will behave like a PCIe 3.0 GPU card due to forward and backward compatibility.
Can a PCIe 4.0 Device Work in a PCIe 3.0 Slot? (Answered)
However, it's important to note that the graphics card will operate at Pcie 3.0 speeds in a Pcie 4.0 slot, as it can only transfer data at the rate supported by the graphics card itself.
HP Z440 TECHNICAL WHITE PAPER Pdf Download | ManualsLib
Integrated PCI and PCI-Express 3.0 The HP Z440 provides one 32-bit/33 MHz PCI slot that can accommodate a full height, full length PCI card.