The CPU question is really a software question. Ask first: what operating system and programs does your application need?
If your plant runs Windows-only equipment software, HMI or older MES clients, you need an x86 machine. The USR-EC100 mini industrial computer runs a 12th Gen Intel J6412 for lightweight Windows tasks; the USR-EC300 (i5-7200U, wide DC 12-36V input) is the general workhorse with six serial ports; the USR-EC500 handles the demanding roles with eight serial ports and five LAN ports. If your application is stuck on Windows, pick x86 and move on — don't fight legacy software.
If your application is Linux-based — Node-RED flows, Docker containers, protocol conversion, edge computing — an ARM industrial computer is usually the smarter buy: lower power, fanless, lower cost, and the software stack (Ubuntu, Node-RED, Docker) comes pre-installed on the EG series out of the box.
But there's a third case that changes everything: AI at the edge. If you need video analysis, defect detection or face recognition on site, a general-purpose CPU alone won't cut it — you need an NPU. The USR-EG928A Edge AI Box runs an RK3588J with a 6 TOPS NPU, supports mainstream frameworks like TensorFlow and ONNX, and can even deploy large models such as DeepSeek 7B. For lighter AI tasks, the EG828-GL packs a 1 TOPS NPU into a compact ARM box. Rule of thumb: no NPU, no edge AI.
One more check on the CPU: industrial-grade silicon. Chips like the RK3562J in the EG628 and the RK3506J in the EG228 are rated for industrial environments, and the boxes are built to match — wide operating temperature, wide-voltage power input, watchdog protection. A consumer chip that throttles at 60°C can cost you a production line shutdown in summer.
RAM is easy to over-spec and painful when it's short. Match it to what actually runs on the box:
Storage: industrial computers use eMMC for reliability — no moving parts, no vibration damage — and SSD for heavier loads. The EG828-GL ships 4GB RAM plus 32GB SSD; the EG928A comes with 128GB eMMC and an external TF slot. Speaking of which: a TF card slot is cheap insurance. Both the EG228 and EG528 have one, so you can grow storage without buying a new box.
Before you order, decide what stays on the device and what goes to the cloud. If raw data must be retained locally for weeks, that changes your storage math more than any spec sheet.
This is where most buyers under-spec. Before talking to any vendor, walk the site and count: how many devices connect by RS485? By CAN? How many digital inputs and outputs do you actually need? Then add at least one spare per type.
Serial.RS485 is the lingua franca of industrial equipment — meters, inverters, VFDs, barcode scanners. If you're aggregating many field devices, look at port density: the EG528 gives you four RS485-capable ports (two dedicated RS485, two switchable between RS485/RS232); the EG828-EMS goes up to eight RS485 plus two CAN for larger energy installations.
CAN.Don't overlook it. Battery packs, vehicles and modern machines talk CAN. The EG228 includes two CAN FD ports — worth having if your project touches anything with a battery management system.
DI/DO.If the box must act, not just read, you need digital I/O. The EG828-EMS carries 16 DI and 16 DO — it can read pulse meters and drive breaker or contactor signals, which is exactly what an energy-management gateway must do. For small jobs, the EG118 (an Arduino-compatible gateway) offers 2 DO, 1 DI and 1 AI plus RS485/232 — enough for irrigation, solar or wastewater projects where you'll write custom C code in the Arduino IDE.
Don't buy to exactly match today's count. Wiring changes and projects expand; an industrial computer with no spare ports is a dead end.
Industrial connectivity is about continuity, not speed. One uplink is not a network.
Every serious install should have at least two paths to the outside world. The EG628, EG228 and EG528 all support Ethernet plus 4G (5G on the EG628) plus Wi-Fi, with automatic network backup. The EG828-GL covers global 4G bands, gigabit Ethernet and Wi-Fi with mutual backup — important if your equipment ships to multiple countries. For AI boxes in the field, the EG928A adds Wi-Fi 6 and reserved 5G/4G expansion slots, so the network can be upgraded later without a hardware swap.
Second, look for built-in routing security. Several EG models integrate router functions — VPN and firewall — inside the box, so your field network is segmented and traffic is tunneled without bolting on another device. For remote sites, choose boxes that can be managed over the cloud: the EG628 and EG528 support remote configuration through PUSR's platform.
And check the protocol, not just the port. The EG828-EMS reports to smart energy storage platforms via MQTT. The EG228 and EG528 speak IEC 61850, IEC 104, DLT645, DNP3.0 and BacNet, and connect to PLCs from Siemens, Mitsubishi, Omron, Modbus, Delta and Fatek. Make sure the box speaks your plant's language before you wire anything.
Here's how the decisions collapse into actual purchases:
Windows-based equipment software in the plant→ x86 series (EC100 / EC300 / EC500). Run the legacy software; don't fight it.
Linux edge computing plus protocol conversion→ EG528 (four RS485-capable ports, HDMI, built-in local SCADA/HMI) or EG228 (fanless, CAN FD, compact, -25°C to +75°C).
Edge AI / video analysis→ EG928A (6 TOPS NPU, up to 32 network cameras, 8K video).
Energy management / solar-storage-charging→ EG828-EMS (8×RS485, 16 DI / 16 DO, MQTT reporting).
On-machine operator interface→ USR-SH800 industrial panel PC with touch screen (RK3568, 2×RS485, 2×RS232, 2×Ethernet), which doubles as the local HMI.
Rapid custom development / prototyping→ EG118 for ESP32/Arduino developers who need an open, fast-to-prototype platform.
Software first:Windows legacy → x86; Linux edge → ARM; AI inference → NPU.
RAM:match to workload — 512MB for light collection, 8GB for AI.
Storage:eMMC for reliability, plus a TF slot for growth.I/O:count serial / CAN / DI / DO on site, then add spares.
Connectivity:at least two uplinks, VPN/firewall built in, cloud-remote manageable.
Environment:fanless, wide temperature range, wide DC input (9-36V), watchdog reset.
An industrial computer is not a PC. It's the piece of hardware that has to outlast the project, survive the cabinet heat, and talk to everything around it. Choose it the way you'd choose a machine tool — by the job it has to do — and you'll only buy it once.
