Using a PCIe x1 card in a PCIe x16 slot

If it's a motherboard slot you're talking about it means it's a x16 physical slot but there are only x4 electrical connections, meaning that

PCIe x4: This slot has four lanes for data transfer It provides more PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots

can you use ddr3 in ddr4 slot No problem whatsoever Also, if you look closely, the bottom x16 slot is actually a x4 slot in the outer shape of a x16 slot See how the pins

can i buy a slot machine All PCIe slots are backward compatible, so if you have an older-generation card, it will work just fine without any trouble This way you can