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8-Port PCIe RS232 Serial Adapter Card - Serial Cards & Adapters | Add-on Cards & Peripherals | StarTech.com
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Amazon.com: Sonnet M.2 2x4 Low-profile PCIe Card (Two M.2 NVMe SSD slots • Add Your Own SSDs Up to 16TB) : Electronics
The Labgore's guide to "converting" full height PCI covers to low profile : r/homelab
Dual SATA (6G) PCIe Controller, Marvell 88SE9120 W Low Profile Bracket
10Gbps USB 3.1 Type-A + Type-C PCI-e Controller Card PCI Express 4x to USB3.1 Type C + A Converter Adapter - AliExpress
Digigram ALP882e Low profile PCIe card with 8x Line I/O
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StarTech.com 16 Port PCI Express Serial Card - Low-Profile - High-Speed PCIe Serial Card with 16 DB9 RS232 Ports - Add 16 RS232 serial ports (DB9) to your low or full-profile computer,
Amazon.com: StarTech.com 1 Port PCIe Network Card - Low Profile - RJ45 Port - Realtek RTL8111H Chipset - Ethernet Network Card - NIC Server Adapter Network Card (ST1000SPEX2L) : Electronics