will a pcie 3.0 work in a pcie 4.0 slot
Mainboard ASRock Z790 Pro RS WiFi (LGA 1700, 4x DDR5, HDMI, Displayport ...
Khe cắm mở rộng: 1 x PCIe 4.0 x16 Slot (PCIE1), 1 x PCIe 3.0 x1 Slot (PCIE2) ... Khe cắm mở rộng: 1 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode, 1 x PCIe ...
ASUS Prime B660M-A D4 LGA 1700(Intel 12th Gen) mATX ...
ROG B650-A|DDR5|PCIE 4.0|M.2 x3|WiFi 6E. ... Next-Gen M.2 Support: One PCIe 5.0 M.2 slot and two PCIe 4.0 M.2 slots, all with heatsinks to maximize performance.
M.2 4x4 NVMe SSD Silent PCIe Card - Sonnet - SONNETTECH
The GPU in the PCIe 3.0 slot will also most likely clock down to x8, but the performance between a GPU running in x8 vs x16 is fairly small and mostly negligible.