AX-234BT vs AX-238BT: which fanless platform fits your deployment?

Most industrial box PCs give you two display outputs and call it multi-display. That is fine until a deployment actually needs four independent screens — and then you are choosing between a second PC, a video splitter that breaks independence, or a USB display adapter that adds latency and a failure point.

The AX-238BT drives four genuinely independent outputs from the same Iris Xe 80 EU engine:

• •LVDS 24-bit (LVDS/eDP selectable) — for an integrated panel
• •DisplayPort 1.4 — high-resolution operator screen
• •HDMI 2.0 — standard monitor or signage
• •2× USB4 Type-C with DP-Alt Mode — additional screens, or a single-cable dock

Each carries its own framebuffer. No mirroring, no splitting, no software compositing overhead.

The AX-234BT drives two displays (HDMI 2.1 + Mini DP 1.4b) plus a Type-C with DP-Alt, with LVDS/eDP as an option. For a single operator screen, or a screen plus a diagnostic monitor, that is enough.

The AX-234BT has one CAN 2.0A/B channel. The AX-238BT has two. One channel is enough when the device is a node on a single bus — an AGV reading motor feedback, a gateway polling a BMS, a controller on a machine’s fieldbus.

Two channels matter when you need network separation:

• •Vehicle deployments — powertrain bus on one channel, body/telemetry on the other. Mixing them means diagnostic traffic adds jitter to the control path.
• •AMR platforms — motion control on one, safety and battery management on the other.
• •Gateway roles — bridging two networks that must not share arbitration.

On both platforms, galvanically isolated CAN rated to 4000 V withstand is available as an ODM configuration rather than a standard fit. If your CAN crosses ground references — vehicle chassis segments, motor drives, long cable runs — specify it at RFQ.

This one is more subtle than the spec sheet suggests.

• •AX-238BT — six COM ports on the rear panel. COM1/2 are BIOS-selectable between RS-232 and RS-485; COM3–6 are RS-232.
• •AX-234BT — two COM ports on the panel (RS-232/422/485), expandable to six via an internal header.

Both can reach six. The difference is what it costs you: on the AX-234BT, ports 3–6 come out of an internal header, which means a ribbon cable and a bracket, or a custom I/O panel as part of an ODM configuration. That is fine if you are already doing a custom enclosure. It is friction if you are deploying a catalogue unit into a rack.

If you need more than two serial devices and you are not doing mechanical customisation, the AX-238BT saves you a step.

The AX-238BT carries two USB4 Type-C ports at 40 Gbps. The AX-234BT carries USB 3.2 Gen1 (5 Gbps) Type-A plus one Type-C. USB4 earns its place for two reasons, and bandwidth is only the first.

Bandwidth — 40 Gbps handles high-bitrate camera capture or external NVMe storage that would saturate USB 3.2. If you are pulling uncompressed frames off a capture device, this is the difference between working and dropping frames.

Cable count — USB4 Type-C carries display, data and power on one connector. A docking station or camera module that would otherwise need three separate cables runs on one. In a vehicle cabin or a crowded control cabinet, that often matters more than the raw number.

If your peripherals are barcode scanners, keyboards and USB storage, USB 3.2 Gen1 is not a limitation and USB4 is not a reason to choose.

This is the difference most spec comparisons miss, and for unattended deployments it is the one that matters most. The AX-234BT’s second Ethernet port uses the Intel i226-LM, which supports Intel AMT — out-of-band management that works independently of the operating system:

• •Remote KVM (see and control the screen and keyboard even at BIOS level)
• •Remote power cycling
• •BIOS configuration changes
• •OS recovery when the host is unresponsive

The AX-238BT uses two i226-V controllers. The V variant does not carry AMT. Combined with the AX-234BT’s discrete TPM 2.0 fitted as standard (on the AX-238BT, TPM is an external module and optional), this makes a concrete difference for:

• •Roadside cabinets and outdoor enclosures where a site visit costs hundreds of euros
• •Machines deployed at customer sites across multiple countries
• •Any 24/7 unattended installation where “reboot it” currently means sending someone

If your deployment is a screen an operator stands in front of, AMT is irrelevant. If it is a box in a locked cabinet 400 km away, it changes your service economics.

Memory ceiling — both take two DDR5 SO-DIMMs. The AX-234BT tops out at 64 GB. The AX-238BT reaches 64 GB on 12th Gen and 96 GB on 13th Gen. 96 GB matters for in-memory workloads: large vision buffers, multi-stream video capture, or running OT and IT workloads in separate VMs on one box. For most edge inference, 32 GB is already generous.

Three independent devices on the AX-234BT lets you separate OS, application data and logging onto different drives — useful when a logging partition filling up should not take the system down, or when data retention policy requires a physically separate drive.

The AX-238BT’s PCIe 5.0 ×4 M.2 slot is faster on paper, though few industrial NVMe drives currently saturate Gen4, let alone Gen5.

On paper, the AX-234BT ships a newer CPU: 13th Gen i5-1345U (up to 4.7 GHz) against the AX-238BT’s 12th Gen i5-1235U (up to 4.4 GHz). Three things keep this from being a decisive gap:

1. Both are 10-core / 12-thread Raptor/Alder Lake-U parts with 12 MB L3 and the same Iris Xe 80 EU graphics. Real-world difference on inference and vision workloads is single-digit percent.
2. Both configure to the same 55 W turbo ceiling, and both are fanless in the same chassis — so sustained performance is governed by the thermal envelope, not the silicon.
3. The AX-238BT platform supports 12th and 13th Gen U and P series. A P-series configuration has more headroom than either U-series part.

If CPU throughput is genuinely your binding constraint, neither of these is the right platform — that conversation should start with a P-series configuration or a discrete-GPU platform.