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Asterfusion CX764QH-N 64x 400GE QSFP-DD data center switch
CX764QH-N switch hardware overview featuring 64x 400G QSFP-DD, 10G SFP+.
CX764QH-N 400G AI Ethernet switch hardware overview featuring hot-pluggable PSUs and fan modules.

CX764QH-N

64×400G AI Ethernet Switch Ultra Ethernet, 25.6Tbps, For AI/ML/Cloud Data Center/HPC

Highlights
  • Advanced AI features: WCMP, INT-driven Routing,Packet Spray and more
  • Deliver port-to-port latency under 700ns.
  • Maximum power consumption 2000W
  • 64x400G OSFP112, with 1x 25GE(SFP28)
  • 10ns PTP and SyncE performance supports.
  • Open AsterNOS based on SONiC with the best SAI support.
  • ZR/ZR+ module supported
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64 x 400G QSFP112, 25.6Tbps, Enterprise SONiC, AI/ML/Cloud Data Center/HPC/Storage

Designed to power the most demanding AI training & inference fabrics, cloud data centers & DCI, high-performance computing (HPC), and distributed storage workloads, the Asterfusion CX764QH-N is a game-changing, high-density 400G 25.6T AI ethernet switch. Featuring 64 x 400G QSFP112 ports, it scales effortlessly to support ultra-large networks with line-rate, non-blocking performance. With an industry-leading low port-to-port latency of ~700ns, the switch guarantees deterministic, high-throughput connectivity critical for latency-sensitive applications. Furthermore, its integrated support for 400G Coherent ZR/ZR+ optics ensures high-capacity, cost-effective interconnectivity for modern long-reach cloud DCI architectures, eliminating the need for expensive external transponder systems

700ns

Ultra
Low Latency

25.6Tbps

Switching
Capacity

10 ns

Class C
PTP Accuracy

KEY POINTS

Key Facts

700ns

Ultra Low Latency

25.6Tbps

Switching
Capacity

10 ns

Class C
PTP Accuracy

Optimized Software
for Advanced Workloads
– AsterNOS

Feature Lists ↓
Pre-installed with Enterprise SONiC, the CX764QH-N packs cutting-edge features like RoCEv2 and EVPN multihoming, delivering lightning-fast forwarding and massive packet buffers for unmatched performance. Fully UEC-compliant, it offers rich open APIs to seamlessly integrate into diverse data center and HPC ecosystems.
As a vendor-neutral platform, it effortlessly supports heterogeneous GPUs and network cards from multiple manufacturers. By combining industry-leading low latency with expansive packet buffering, the CX764QH-N sets the gold standard for next-generation AI-era data centers.

Optimized Software for Advanced Workloads – AsterNOS

Fully compliant with UEC standards, it offers extensive open APIs for smooth integration into diverse data center and HPC environments. As a vendor-neutral platform, it supports heterogeneous GPUs and network cards from multiple manufacturers. Combining cutting-edge low latency with large packet buffers, the CX764QH-N sets the benchmark as the go-to switch for next-generation AI-era data centers.
Feature Lists ↓

RoCEv2

Easy RoCE
PFC
ECN
DCBX

Cloud
Virtualization

DCI
VXLAN
BGP EVPN

In-Band Network
Telemetry

INT Based Routing
Flowlet
WCMP
Packet Spray

High
Availability

ECMP
MC-LAG
EVPN Multihoming

Cloud Virtualization

DCI
VXLAN
BGP EVPN

RoCEv2

 PFC/ECN/DCBX
Easy RoCE

High Availability

ECMP
MC-LAG
EVPN Mulithoming

Ops Automation

REST API/NETCONF/gNMI
In-band Telemetry

Specifications

Ports64x 400G QSFP112, 1x 25G SFP28Switch ChipClounix
Switching Capacity25.6TbpsPort-to-port latency700 ns
Packet forwarding rate 21600 MppsPacket Buffer120MB
CPU Intel Xeon 4/Marvell OCTEON10 CN102
USB1 x USB2.0
RAM16GB/32GB DDR4, extensible to 96GBConsole1 x Console RJ45
SSD256GB M.2 SATAMGMT1 x MGMT GE RJ45
Hot-swappable Fans4 (3+1Redundancy)Hot-swappable Power Supplies
2 (1+1Redundancy)
Height2UDimensions
(WxHxD mm) 		440x87x760
Input voltage100-240V AC
240V DC		Operating temperature0 to 40℃(32 to 104 °F)
Maximum power consumption2000W (with full ports of 400G-SR4)
Relative humidity10% - 90% (non-condensing)
PTP (Optional)Class C Level (10ns)

Quality Certifications

ISO-9001-SGS
ISO-14001-SGS
ISO-45001-SGS
ISO-IEC-27001-SGS
fcc-icon
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Segment Routing over IPv6

Leverages SRv6 to achieve network programmability, efficient traffic optimization, and simplified service orchestration,
helping data centers build more agile and scalable infrastructures.
srv6 for CX764QH-N 400G AI Ethernet Switch

Full RoCEv2 Support for Ultra-Low Latency and Lossless Networking

Asterfusion 400G switches deliver full RoCEv2 support with ultra-low latency and
near-zero CPU overhead. Combined with PFC and ECN for advanced congestion control, it enables a true lossless network.
Diagram comparing TCP/IP stack vs RDMA stack, highlighting Asterfusion 800G switches' full RoCEv2 support for ultra-low latency and lossless networking with near-zero CPU overhead
Optimized Features for AI/ML/HPC
Asterfusion Enterprise SONiC is optimized for AI/ML/HPC scenarios, supporting dynamic intelligent traffic distribution (Packet Spray);
Efficient and resilient path selection via WCMP (Weighted Cost Multi-Path);
Real-time precise telemetry routing based on INT Driven Routing;
as well as technologies like Flowlet and Auto Load Balancing to enhance traffic management.
Asterfusion Enterprise SONiC features for AI/ML/HPC networking illustration

Asterfusion Network Monitoring & Visualization

AsterNOS supports Node Exporter to send CPU, traffic, packet loss, latency, and RoCE congestion metrics to Prometheus.
Paired with Grafana, it enables real-time, visual insight into network performance.
AsterNOS network monitoring with Prometheus and Grafana dashboard

O&M in Minutes, Not Days

Automate with Easy RoCE, ZTP, Python and Ansible,  SPAN / ERSPAN Monitoring & more—cutting config time, errors, and costs.
Asterfusion network O&M automation tools diagram

Asterfusion 400G Switch Outperforms InfiniBand in AI Inference with Higher TGR and Lower Latency

In AI inference networks, the Asterfusion 400G switch delivers higher TGR (Token Generation Rate) and lower P90ITL (90th Percentile Inter-Token Latency) compared to InfiniBand, demonstrating faster inference speed and greater overall throughput performance.
Bar chart comparing Token Generation Rate (TGR) between Asterfusion 800G RoCE switch and InfiniBand switch, showing up to 27.5% higher AI inference performance
Bar chart comparing P90ITL (90th percentile inter-token latency) between Asterfusion 800G RoCE switch and InfiniBand switch, showing up to 20.4% lower AI inference latency
↑27.5%

Token Generation Rate

↓20.4%

Inference Latency

↑27.5%

Token Generation Rate

↓20.4%

Inference Latency

Related Products

CX764QD-NCX764QO-NCX764QH-N
Port Speeds64x400G QSFP-DD, 2x10G SFP+64x400G OSFP, 2x10G SFP+64x400G QSFP112, 1x25G SFP28
Hot-swappable PSUs and FANs1+1 PSUs, 3+1 FANs1+1 PSUs, 3+1 FANs1+1 PSUs, 3+1 FANs
MC-LAG√√√
BGP/MP-BGP√√√
EVPN√√√
BGP EVPN-Multihoming√√√
RoCEv2√√√
PFC √√√
ECN√√√
In-band Telemetry√√√
Packet Spray√√√
Flowlet√√√
WCMP√√√
INT-based Routing√√√
Auto Load Balancing√√×
SRv6××√

Panel

CX764QH-N switch hardware overview featuring 64x 400G QSFP-DD, 10G SFP+.
CX764QH-N switch hardware overview featuring hot-pluggable PSUs and fan modules.

Warranty & Support

2-year hardware warranty

1-year free software upgrades & technical support

FAQs

Does it support Inband Telemetry / INT? Can it be used for traffic visualization and bottleneck analysis?

CX764QH-N supports INT. It can report metrics of BDC (Buffer Drop Collector) and HDC (High Delay Collector) to Promethus, bottleneck analysis can be realized via Grafana.

Does the CX764QH-N support high-power 400G Coherent ZR/ZR+ optical modules?

Yes. The entire CX764Q-N series, including the CX764QH-N, natively supports 400G Coherent ZR/ZR+ modules. This allows network operators to implement cost-effective, high-capacity Data Center Interconnect (DCI) directly over long distances without needing external transponder equipment.

Since the CX764QH-N does not support Adaptive Routing (ARS), how does it prevent congestion in RoCEv2 AI fabrics?

While ARS is specific to the QD/QO models, the CX764QH-N fully supports Packet Spraying across the fabric. When paired with modern NICs capable of handling out-of-order packet reassembly, Packet Spraying achieves maximum fabric efficiency and ultra-low tail latency for AI/ML workloads.

Why does the CX764QH-N use QSFP112 ports instead of QSFP-DD or OSFP? What is the architectural benefit?

The 64 x 400G QSFP112 port configuration utilizes 4 channels of 112Gbps PAM4 SerDes per port. This matches the native SerDes speed of next-generation 112G ASICs and AI accelerators perfectly, simplifying the physical layer design, reducing signaling complexity, and maintaining ultra-low port-to-port latency.

How does the CX764QH-N assist network engineers in detecting microbursts without ARS?

The CX764QH-N natively supports In-band Network Telemetry (INT). Even without ARS, INT allows the switch to embed real-time, per-packet metadata (such as queue depths, timestamps, and latency). This provides pinpoint visibility into network microbursts, which can be visualized instantly via the AsterNOS Prometheus/Grafana dashboard.

What are the differences in the control plane and breakout management interfaces for the CX764QH-N compared to other models?

Structurally, while the QD/QO models feature two 10GE SFP+ ports for high-speed auxiliary networking, the CX764QH-N comes equipped with one 25GE SFP28 interface instead. This provides a higher bandwidth uplink option for dedicated out-of-band management or high-speed control plane synchronization.

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