World's First Graphics Card Featuring Slot Innovation

Depend on the chipset, but no it will not 16X is dedicated to the PCIe slot and 4x is dedicated to the NVME slot, another 4x to 8x lanes

ASUS has the most unique GeForce RTX 4060 TI GPU with a quirky feature, a built-in slot

gpu stuck in pcie slot PCIe x4 slot with Lower impedance CONNECTIVITY Dual NVMe PCIe * Connectors

gpu slot name Prototype of card with Nvidia GeForce RTX 4060 Ti GPU shows an slot on the back of the PCB, which make use of the card's spare PCIe 4 lanes