Industrial PC, SCADA, and edge control projects rarely ask for a standard desktop. Sometimes you need a tiny computer-on-module to keep a legacy HMI running, sometimes a backplane amplifier card for an old PLC rack, and sometimes a small embedded box you can load with your own memory and storage. The four used controllers here span that range, with prices from $14.72 to $254.15, so the right choice depends on your existing system as much as your budget.
Quick take
Start with the hardware you already have. The Toradex Colibri PXA310 is a module built for Toradex Colibri carrier boards, so it only makes sense if your project targets that form factor. The PLC C515RA is a DIN 41612 analog amplifier card meant for vintage automation racks. The Egan 470590 is an ISA-bus graphic controller aimed at CNC or machine-interface repairs. The Dell Embedded Box PC 5000 is the closest thing to a conventional PC, but it ships without RAM or hard drive, and the listing is vague on the CPU, so treat it as a barebone chassis and bring your own components.
Price comparison at a glance
| Product | Price | Price bar |
|---|---|---|
| Toradex Colibri PXA310 | $14.72 | |
| PLC C515RA | $150.00 | |
| Dell Embedded Box PC 5000 | $80.00 | |
| Egan 470590 | $254.15 |
Decision matrix
| Use case | Best fit | Watch out |
|---|---|---|
| Low-cost ARM module for a Colibri-based system | Toradex Colibri PXA310 | Only the module; no carrier or accessories |
| Analog amplifier card for a backplane rack | PLC C515RA | Untested vintage board; ESD-sensitive |
| ISA video controller for CNC/display repair | Egan 470590 | Highest price here, narrow compatibility |
| Build-it-yourself embedded PC | Dell Embedded Box PC 5000 | Missing RAM and storage; CPU not confirmed |
Toradex Colibri PXA310 624MHz ARM SOM
At $14.72, this is the least expensive way into a Toradex Colibri PXA310 project. It's a used ARM computer-on-module removed from decommissioned industrial equipment, inspected and confirmed working, with grade B cosmetics. If you already have a Colibri carrier board and need a replacement for a legacy HMI, industrial controller, or embedded automation platform, this low-cost module is an easy gamble. The limitation is the lack of anything else: you get only the module, so you must have the surrounding Colibri infrastructure and a WinCE-era firmware setup ready. The used condition also means normal cosmetic wear from previous use, which is fine for a spare board but worth knowing when you unbox it.
PLC Industrial Control PCB - A1 Final Amplifier Card C515RA
The $150 C515RA sits in the middle of this group, but it serves a very specific role. The DIN 41612 edge connector signals a backplane-mounted rack, and the A1 Final Amplifier label suggests analog signal amplification or conditioning near the output of a motion or automation system. If that matches your repair target, this used board is worth a look. The honest caveat: it's untested, so you are buying a clean-looking vintage board and hoping the original components still perform. Multiple trim potentiometers give you calibration options, but the board's ESD-sensitive MOS circuit means you'll want proper grounding and careful handling during installation. It's a niche spare part, not a general-purpose computer.
Egan 470590 Graphic Controller Board ISA Video Card
The Egan 470590 is the most expensive option here at $254.15. It's a used ISA-bus graphic controller board, tested, with an onboard processor and multiple IC banks, and it includes video/output connectors for display or machine interface tasks. If you're repairing a CNC machine interface or a legacy industrial video system that uses this specific board, the fact it has been tested and shows no visible damage gives it an edge over untested boards. The limitation is the price and the narrow scope: ISA edge connectors are decades old, so this board is only a sensible buy when you have a dedicated industrial system waiting for it. For a general-purpose modern PC, it's the wrong tool.
DELL EMBEDDED BOX PC 5000 w/ Intel Core i7-6820EQ 2.80 GHZ | No HD No RAM
The Dell Embedded Box PC 5000 is the most familiar form factor in this lineup. At $80, it gives you a used Dell SFF embedded PC from seller t4QD-NTWTS, with BIOS not locked and DDR4 memory supported. The major catch is that it ships without RAM or hard drive, so you'll need to add both before booting. The title mentions an Intel Core i7-6820EQ, but the description says no CPU, so the processor configuration is unclear; for safety, treat the i7 as a potential spec rather than a guarantee. If you have spare components on hand, this could become a budget SCADA or edge-control micro-PC. Without them, factor in the extra cost of memory, storage, and possibly a CPU.
Final recommendation by use case
- For a low-cost ARM module to revive or extend a Toradex Colibri system, go with the Toradex Colibri PXA310.
- For a backplane-mounted analog amplifier card in a PLC or motion-control rack, pick the PLC C515RA.
- For a tested ISA graphic controller in a CNC or industrial display repair, choose the Egan 470590.
- For a build-it-yourself embedded PC with a Dell SFF chassis, start with the Dell Embedded Box PC 5000.
