can i use pcie 4.0 in 3.0 slot
Teardown of GIGABYTE RTX 5060 Ti EAGLE Card ...
Yes, you can use a PCIe 3.0 card in a 2.0 slot, but with some caveats, which I will cover below.
Mainboard MSI MPG Z490 GAMING PLUS (Intel ...
Intel® 11th & 10th Gen Processors. 1 x PCIe 4.0/3.0 x16 slot*. - Intel® 11th processors support PCIe 4.0 x16. - Intel® 10th processors support PCIe 3.0 x16.
Can I Use a PCIe 3.0 Card in a 2.0 Slot? - PC Guide 101
The card takes a PCIe 4.0 x16 slot (can be run at PCIe 3.0 mode, for what it’s worth), and branches out into four PCIe 4.0 M.2 slots.