Add Samsung PM981a NVME tested via Argon40 NEO 5 M.2 NVME case

_cards_m2/samsung-pm981a-nvme.md

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+---
+layout: card
+title: "Samsung PM981a SSD 512 GB NVMe"
+picture: "/images/m2-samsung-pm981a-nvme.jpg"
+functionality_cm4: "Untested"
+functionality_pi5: "Full"
+driver_required: "No"
+github_issue: "https://github.com/geerlingguy/raspberry-pi-pcie-devices/issues/48"
+buy_link: []
+videos: []
+---
+
+I evaluted the usage of this drive through a [Argon40 NEO 5 M.2 NVME case](https://argon40.com/products/argon-neo-5-m-2-nvme-for-raspberry-pi-5) with a RPi5 8GiB model.
+
+The PM981a is the OEM version of the 970 EVO Plus
+I tested to ensure the adapter board functionality performed reasonably well;
+Results are shown below.
+
+| Benchmark                  | Result |
+| -------------------------- | ------ |
+| iozone 4K random read      | 73.74 MB/s |
+| iozone 4K random write     | 167.21 MB/s |
+| iozone 1M random read      | 412.16 MB/s |
+| iozone 1M random write     | 381.59 MB/s |
+| iozone 1M sequential read  | 419.09 MB/s |
+| iozone 1M sequential write | 377.52 MB/s |