Will my graphics card work in all PCIe slots?

I've filled up my motherboards 8 sata slots and now I'm looking for an HBA to get 8 more Alas, I've only got a pcie x8 physical with x4

When it is installed into a PCIe slot the performance is lower, but the overall gaming experience is better than most older video cards that

pcie slot bracket ECN, September 3, 2014 SMBus interface for SSD Socket 2 and Socket 3 SMBus This optional normative ECN defines 3 new PCIe trans view more This

pcie 4 card in pcie 3 slot Understanding the Compatibility of PCIe 4 Graphics Cards in PCIe 3 Slots · 1 Bandwidth Limitations: A PCIe 3 slot offers half the bandwidth of a PCIe 4 slot,