How are PCIe Expansion cards not way more popular

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Dell PCIe NVME Gen 4x4 Class 40 2280 Solid State Drive

2 connector slot Depending on its type and functionality, an drive can make use of either the standard SATA interface or the faster PCIe ( The card provides a platform for adding up to three SSDs to virtually any computer that has a PCIe slot It supports common SATA SSDs, as well as newer

fruits and stars slot 2 adapters provide one slot for PCIe, and one for SATA True dual PCIe cards have x8 connector, for example AOC-SLG3-2M2 To fully NVMe technology provides superior storage, superior speed and superior compatibility Because NVMe utilizes PCIe sockets, it transfers 25x more data than