When you're outfitting a SCADA workstation, an edge controller, or an industrial control panel, the hard part isn't processing power-it's matching the hardware to the physical job. Do you need a Windows desktop small enough to mount behind a monitor? A replacement amplifier card for an existing PLC rack? Or a low-cost board for prototyping an edge node? These four options span $59.99 to $199.99, and the right choice changes with your use case.
Quick Take
- Lenovo ThinkCentre M715q Tiny ($199.99) is a strong all-around Windows edge node here.
- Lenovo ThinkStation P320 Tiny ($159.99) is the compact Windows desktop for graphics-focused workloads.
- PLC Industrial Control PCB - A1 Final Amplifier Card C515RA ($150.00) is a used backplane card for legacy industrial racks, not a complete computer.
- Raspberry Pi 4 Model B ($59.99) is the most affordable, flexible edge development platform.
Listed Price Comparison
| Product | Listed Price | Price Bar | Best fit |
|---|---|---|---|
| Raspberry Pi 4 Model B 2GB (Free Case) | USD 59.99 | Low-cost edge prototyping, learning, lightweight data collection | |
| PLC Industrial Control PCB - A1 Final Amplifier Card C515RA | USD 150.00 | Replacing a signal amplifier card in a DIN 41612 backplane | |
| Lenovo ThinkStation P320 Tiny (i5-7400T / 16GB / 128GB M.2 / P600 / Win 10P) | USD 159.99 | Compact Windows workstation | |
| Lenovo ThinkCentre M715q Tiny (Ryzen 5 Pro / 16GB / 1TB SSD / Win 11) | USD 199.99 | Ready-to-run SCADA or edge node |
How to Choose
- Need a complete Windows PC? The Lenovo ThinkCentre M715q Tiny and Lenovo ThinkStation P320 Tiny are the two ready-to-run desktops here.
- Need a dedicated GPU? Focus on the Lenovo ThinkStation P320 Tiny.
- Need a rack-level repair part? The PLC C515RA board is the spare-part option, not a standalone system.
- Need the lowest entry price? Choose the Raspberry Pi 4 Model B.
Product Notes
Lenovo ThinkStation P320 Tiny (i5-7400T, 16GB, 128GB M.2, P600, Win 10P)
This refurbished ultra-small desktop pairs an Intel i5-7400T with 16GB of RAM and a 128GB M.2 SSD in a chassis that mounts neatly behind a display. The dedicated NVIDIA Quadro P600 is the main reason to pick it over the ThinkCentre: if your SCADA client benefits from stable GPU acceleration and you need both DisplayPort and Mini DisplayPort outputs, this desktop covers that in a small footprint. The limitation is storage-128GB is enough for an operating system and focused applications, but you won't be storing a long local historian here. Windows 10 Pro, Wi-Fi, Bluetooth, and built-in speakers are part of the package.
Lenovo ThinkCentre M715q Tiny (Ryzen 5 Pro, 16GB, 1TB SSD, Win 11)
This refurbished micro form factor desktop is a turnkey Windows option in the group. An AMD Ryzen 5 Pro, 16GB of DDR4 RAM, and a 1TB 2.5-inch SSD give you room for SCADA clients and local logs without immediately needing external storage. Windows 11 Pro is preinstalled, and the Radeon RX Vega 11 graphics are fine for everyday HMIs and web-based dashboards. The usable ports include USB 3.1, USB 2.0, DisplayPort, RJ-45 Ethernet, and audio. It's a strong daily driver, but if your work involves heavy CAD-style rendering, remember that the graphics are integrated rather than a separate card.
PLC Industrial Control PCB - A1 Final Amplifier Card C515RA
This is a component-level buy, not a complete controller. The used A1 Final Amplifier PCB, marked C515RA, uses a DIN 41612 backplane edge connector and appears to be a final-stage signal amplifier rather than a power amplifier. Trim potentiometers allow calibration, red ejector handles make rack removal easier, and the board carries an ESD-sensitive marking. If you maintain legacy PLC-based automation or motion control systems, this card could serve as a replacement or a bench spare. The limitation is that it is untested, so confirm compatibility with your rack's pinout and signal levels before installation.
Raspberry Pi 4 Model B 2GB (Free Case)
This used Raspberry Pi 4 comes with a free 3D printed PETG case, making it a simple way to get started on a low budget. The board includes 2GB RAM, Wi-Fi, Bluetooth, Gigabit Ethernet, USB 3.0, dual micro HDMI outputs up to 4Kp60, and a GPIO header. It's well suited for lightweight data collection, small HMI dashboards, and automation experiments. It is not a drop-in Windows SCADA workstation; the ARM-based board and 2GB memory are better matched to lighter Linux or real-time workloads. The main constraint is that 2GB of RAM forces you to keep workloads lean.
Final Recommendation by Use Case
- For a ready-to-run Windows edge/SCADA node with room to store data: Lenovo ThinkCentre M715q Tiny.
- For a compact desktop aimed at graphics-heavy edge visualization: Lenovo ThinkStation P320 Tiny.
- For PLC rack maintenance or a signal amplifier card backup: PLC Industrial Control PCB - A1 Final Amplifier Card C515RA.
- For the lowest-cost edge prototyping and teaching platform: Raspberry Pi 4 Model B.
