As confirmed by the IPM17-DD2 documentation, the board supports (e.g., 2x 8GB modules) operating at 2133MHz . Faster DDR4 modules will work but will be down-clocked to this speed.
Here’s what you need to know before upgrading the key components of your IPM17-002 system. ipm17-002 motherboard manual
Four DDR4 DIMM slots (288-pin). Supports up to 64GB (usually tested to 32GB by HP) of DDR4-2133 MHz memory. Expansion Slots: 1x PCIe x16 (for graphics cards). 1x PCIe x1 (for expansion cards). 1x M.2 socket 1, Key A (for Wi-Fi/Bluetooth cards). 1x M.2 socket 3, Key M (for SSDs). As confirmed by the IPM17-DD2 documentation, the board
The power switch connection is standard. The header should have two pins. Connect the two wires (usually black) from your case's power switch to these pins; the orientation does not matter for the power switch to function. Four DDR4 DIMM slots (288-pin)
To get your system running, you only need to connect the Power Switch and Power LED. The Reset Switch is optional.
One PCI Express x16 slot. It supports modern GPUs, but ensure your power supply unit (PSU) can handle the wattage of an upgraded card.