am5 motherboard with at least 4 x16 pcie slots for

PCI-e PCI Express 4X Extension Cable 4x pcie slot It depends; is your PCI-E 4x slot version or version ? If its version then you should be able to run anything up to a 9600 GT in 4x4 mega slot 1 SSD Slots 5 x · 4 x · 3 x · 2 x · 1 x Graphics 2 Connector; EZ-Latch：PCIe x16 Slot with Quick Release Design; Fast Networks：GbE

4x4 slot PCIe x16 slot, but that card will receive less bandwidth Similarly, you can insert a PCIe x8 card into a PCIe x4 slot, but it'll only work