The SanDisk Optimus GX PRO 8100 with heatsink is an M.2 2280 NVMe SSD with a PCIe 5.0 x4 interface. This 8TB version has a low-profile anodized aluminium heatsink with RGB LED and, according to the datasheet, is backwards compatible with PCIe 4.0 and 3.0. At 11.25 mm it is slightly thicker than the smaller capacities.
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