Product Overview

The MSI HERALD BE9400 WiFi 7 PCIe Card (model IO3446) is a cutting-edge internal wireless LAN card supporting the latest WiFi 7 (802.11be) standard. It connects via a PCI Express x1 interface, making it a simple upgrade for any desktop PC. With a maximum data rate of 5764 Mbps on the 6 GHz band using 320 MHz channels, it handles 4K/8K streaming, online gaming, and large file transfers with ease.

Manufactured by MSI and sold/fulfilled by Amazon.co.jp (ASIN: B0GH1MHH1F), this card includes a magnetic-base external antenna that can be placed away from the PC case for optimal signal reception—ideal for metal desks or crowded environments.

Key Features

  • WiFi 7 (802.11be): 4096-QAM modulation delivers up to 20% faster speeds compared to WiFi 6.
  • Multi-Link Operation (MLO): Simultaneously uses 2.4 GHz, 5 GHz, and 6 GHz bands for lower latency and more stable connections in congested networks.
  • 6 GHz Band & 320 MHz Channels: Unlocks up to 5764 Mbps for bandwidth-intensive tasks like 8K streaming and video conferencing.
  • Magnetic-Base External Antenna: Place the antenna away from the PC case to improve reception; attaches to metal surfaces or sits on a desk stand.
  • WPA3 Security: Supports the latest security standard with SAE authentication for protection against brute-force attacks—suitable for enterprise environments.

Compatibility Guide

  • Interface: PCI Express x1 (works in x4/x8/x16 slots).
  • Supported OS: Windows 10 / 11 (64-bit). Linux and macOS are not officially supported.
  • Antenna Placement: The magnetic base attaches to ferrous metal surfaces; a desk stand is included for non-metal surfaces.
  • Important: Full WiFi 7 performance requires a WiFi 7 router. The card works with WiFi 6/6E routers but at reduced speeds.

Ideal Use Cases

  • Desktop WiFi Upgrade: Perfect for rooms without easy Ethernet access or for a cleaner cable setup.
  • Creators & Remote Workers: Fast uploads/downloads for large media files, smooth 4K/8K editing, and reliable video calls.
  • Gamers: Low-latency, stable online gaming—especially when paired with a WiFi 7 router for the best experience.

Upgrade Considerations

  • Router Compatibility: To use MLO, 6 GHz, and 320 MHz channels, you need a WiFi 7 router. With older routers, speeds will be limited.
  • PCIe Slot Availability: Check your motherboard layout to avoid physical interference with the GPU or other cards.
  • Antenna Cable Length: The included cable is about 1 meter. For longer distances, consider an extension cable (sold separately).
  • Overkill Potential: If your internet plan is under 1 Gbps, you won't max out WiFi 7 speeds externally, but internal network transfers (e.g., NAS) will still benefit.

Product Disclosure (Amazon)

  • Manufacturer: MSI
  • Seller: Amazon.co.jp
  • Fulfilled by: Amazon.co.jp
  • ASIN: B0GH1MHH1F
  • Note: This article covers a manufacturer-made product based on Amazon listing details.