Can I use x16 PCIe Gen for ASUS Hyper card, and x4 PCIe

can you put a pcie x4 in a x16 slot   Dan candy stash slot

but since im using the first pci-express x16 slot with graphic card i can only use the second slot and second pci-express x16 slot conforms

Next Generation Storage：1*PCIe x4 and 2*PCIe x4 Connectors EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design PCIegen 4with up to 2x bandwidth 7PCIe slots Up to300Wauxiliary power One PCIe x4 gen 3 Apple IO card Four PCIe x8 gen 4 Two single height Two double

electronisch slot You can use PCIe X4 slots for storage expansion cards Each X4 slot capable of 4GBs, so its better to have one device per slot  You can use these PCIe SSDs in older AMD- and Intel