MikroTik CRS804-4DDQ-hRM Multi-Gig Switch with 2x 10G Ethernet, 4x QSFP56-DD Ports. Compact 400G switching for AI clusters, storage fabrics, and lightning fast

CRS804 DDQ

A compact 1U 400G switch built for AI clusters, storage fabrics, and high-speed aggregation, featuring four 400G QSFP56-DD ports, dual 10 Gigabit Ethernet, and RouterOS v7. With hot-swap power supplies, robust cooling, and low power consumption, it delivers ultra-high bandwidth, wire-speed performance, and future-proof scalability at an accessible price point.

- Includes the RMK-2x10/19 accessory, so you can mount two CRS804 switches in a single 1U slot of a standard 19-inch rack
- 4 GB of RAM
- Quad-core 2 GHz ARM CPU
- Dual-redundant hot-swap power supplies
- 2x hot-swap cooling fans
- RouterOS v7

Reach wire-speed on all ports with the mighty Marvell switch-chip!

The CRS804 DDQ is a compact and reliable 400 Gigabit switch designed for modern AI workloads and next-generation network upgrades. With four 400G QSFP-DD ports and dual 1/10G Ethernet, it delivers exceptional bandwidth density in a quiet and efficient 1U form factor.

Inside, a Marvell 98DX7335 switch chip works together with a hefty quad-core 2.0 GHz ARM CPU, 4 GB of DDR4 RAM, and RouterOS v7. This provides advanced traffic control, high performance switching, and a familiar management environment trusted by users worldwide.

The CRS804 DDQ is designed for long-term reliability and low cost of ownership, supported by hot-swap power supplies (included!), robust cooling, and low power consumption that reaches only 123 W at full load with optics installed.

4x 400G QSFP56-DD ports

2x 1G/10G Ethernet ports

* QSFP-DD ports also support break-out modes to 1G/2.5G/5G/10G/25G/50G

Where does it fit

AI and GPU clusters - A perfect building block for small to medium AI installations. It delivers predictable, low-latency performance and full wire-speed switching, keeping GPU nodes and storage traffic flowing without bottlenecks. The compact design and low power usage make it suitable for AI labs, research environments, and smaller rack deployments.

Future proofing for existing networks - The MikroTik CRS804 DDQ can act as a high speed core or aggregation switch even in older racks. Each 400G QSFP-DD port is built from eight independent data lanes. This enables flexible breakout options, including two 200G links for AI workloads or lower-speed connections such as 100G or 40G. You can deploy the CRS804 DDQ in your existing network today and upgrade to higher speeds over time without replacing the switch. With the right breakout cables, the CRS804 DDQ can interconnect virtually any device with SFP or QSFP ports, regardless of generation.

All-flash storage fabrics - Use native 400G ports for fast storage uplinks or split them into dual 200G links. Ideal for media production, scientific workloads, and any environment where rapid data movement is essential.

Compact 400G fabrics in limited rack space - Create a powerful spine or backbone fabric using four 400G ports. Perfect for small datacenters, enterprise pods, edge compute installations, and environments where traditional 400G equipment would be too loud, too large, or too expensive.

With CRS804, 400 Gigabits is no longer out of reach - it's an affordable way to launch your network into the future, while keeping your existing gear in the loop!