Why Choose MikroTik CRS804-4DDQ?
MikroTik CRS804-4DDQis designed as a cost-effective way to bring 400 Gigabit networking into smaller deployments without giving up flexibility or reliability. With a Marvell switch chip, a quad-core ARM CPU, RouterOS v7, hot-swap cooling, and dual-redundant hot-swap power supplies, it is built to handle demanding workloads while keeping operation efficient and manageable. It is especially suited for AI labs, small to medium AI installations, storage environments, and compact data center fabrics.

Core Features & Benefits of MikroTik CRS804-4DDQ
Centralized High-Speed Switching
At the center of the MikroTik CRS804-4DDQ is a 400G switching design intended for AI clusters and storage fabrics. The switch provides four 400G QSFP-DD ports and supports wire-speed operation across all ports, giving network designers a compact platform for building fast core or aggregation layers.
Connectivity & Compatibility
The switch includes 2x 1G/10G Ethernet ports and 4x 40G/50G/100G/200G/400G QSFP-DD ports. The QSFP-DD ports also support breakout modes to 1G/2.5G/5G/10G/25G/50G, which makes the CRS804 useful in mixed-generation networks where different speeds and device types need to work together.
Performance & Hardware
Inside the switch is a Marvell 98DX7335 switch chip paired with a quad-core AL52400 2.0 GHz ARM 64-bit CPU, 4 GB of DDR4 RAM, and 512 MB of NAND storage. This hardware combination supports high-performance switching and traffic control, while RouterOS v7 provides a familiar management environment for advanced networking setups.
Software & Ecosystem
MikroTik CRS804-4DDQ runs RouterOS v7 and includes License Level 6. This gives users access to MikroTik’s established switching and routing ecosystem, making the device practical for IT teams that already work with RouterOS-based infrastructure.
Security, Reliability & Uptime
The datasheet highlights dual-redundant hot-swap power supplies and 2 hot-swap RouterOS v7 cooling fans, helping reduce downtime during maintenance or hardware replacement. The unit is also designed for long-term reliability and low cost of ownership, with a maximum power consumption of 123 W with optics installed.
Special Deployment Flexibility
MikroTik CRS804-4DDQ is positioned as a practical building block for small to medium AI installations, all-flash storage fabrics, and compact 400G fabrics in limited rack space. Its breakout support also makes it useful for future-proofing existing networks, since it can interconnect with older and newer equipment through the right breakout cables.

Key Features & Highlights of MikroTik CRS804-4DDQ
- 4x 400G QSFP-DD ports for ultra-high-speed networking
- 2x 1G/10G Ethernet ports for management or legacy connectivity
- Supports breakout modes to 1G/2.5G/5G/10G/25G/50G on QSFP-DD ports
- Marvell 98DX7335 switch chip for wire-speed switching
- Quad-core AL52400 2.0 GHz ARM 64-bit CPU
- 4 GB DDR4 RAM and 512 MB NAND storage
- RouterOS v7 with License Level 6
- Dual-redundant hot-swap power supplies
- 2 hot-swap cooling fans
- Compact design for AI, storage, and aggregation deployments
- Maximum power consumption of 123 W with optics installed
Hardware Overview
Product Code
MikroTik CRS804-4DDQ
CPU
Quad-Core AL52400, 2000 MHz, ARM 64-bit
Memory
4 GB DDR4 RAM
Storage
512 MB NAND
Ports
2x 1G/2.5G/5G/10G Ethernet ports
4x 400G QSFP56-DD ports
Switch Chip
Marvell 98DX7335
Cooling
2 hot-swap RouterOS v7 cooling fans
Power
Dual-redundant hot-swap power supplies
2 AC inputs
100–240 V AC input range
Operating Temperature
-10°C to +60°C

Software & Ecosystem
MikroTik CRS804-4DDQ runs RouterOS v7 with License Level 6, making it suitable for advanced MikroTik-based network deployments. It is designed for users who want strong switching capabilities with a flexible software environment for modern infrastructure planning and management.
Ideal Use Cases of MikroTik CRS804-4DDQ
- AI clusters and GPU networking
- Small to medium AI installations
- All-flash storage fabrics
- Compact 400G backbone or spine layers
- Enterprise aggregation switching
- Edge compute deployments
- Future-proofing existing mixed-speed networks
- Rack space-conscious data center builds
FAQs
1. How many high-speed ports does the MikroTik CRS804-4DDQ have?
It has 4x 400G QSFP-DD ports and 2x 1G/10G Ethernet ports.
2. Does the switch support breakout modes?
Yes. The QSFP-DD ports support breakout modes to 1G/2.5G/5G/10G/25G/50G.
3. What operating system does it use?
It runs RouterOS v7 with License Level 6.
4. Is the power supply redundant?
Yes. The datasheet lists dual-redundant hot-swap power supplies.
5. What is the maximum power consumption?
The maximum power consumption is listed as 123 W, with optics installed.