I harvested a PCIe Gen3 x2 NVMe 1.3 SSD from my older laptop, the problem is that its length is short. I've held it in place with some tape, it should hold.
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PCIe x2 VS PCIe x4 SSD! Read/Write Speed two budget NVME SSD - YouTube
Jual Ssd Nvme Pcie X2 Terbaru - Harga Murah September 2022 & Cicil 0%