A99-10X400GE-X-TR=: How Does Cisco’s 400G M
Overview of the A99-10X400GE-X-TR= The A99-10X400...
The Cisco NXK-HV-6.3KW20A-A= is a high-efficiency power supply engineered for Cisco Nexus 9000 series chassis and UCS blade systems, designed to support high-density GPU/ASIC workloads in modern data centers. According to Cisco’s hardware documentation, this unit features:
The PSU employs silicon carbide (SiC) MOSFETs and LLC+SR topology, reducing switching losses by 40% compared to traditional IGBT-based systems.
Cisco-validated testing under full load conditions demonstrates:
Output ripple: <30mVpp (48V rail)
Hold-up time: 20ms @ 90% load
Inrush current: 18A peak (240V input)
Dynamic load response stabilizes within 150μs for 0-100% step changes, critical for AI training clusters with variable power demands.
Supports NVIDIA DGX H100 racks with 8x GPU trays, maintaining <1°C coolant temperature delta across 42U racks.
Meets ETSI EN 300 019-1-4 Class 4.1E specifications for humidity (5-100%) and corrosive gas resistance (H2S <3 ppb).
[“NXK-HV-6.3KW20A-A=” link to (https://itmall.sale/product-category/cisco/).
Validated for:
Requires Cisco CDU-30L-MOD coolant distribution unit for closed-loop liquid cooling infrastructure.
Cisco’s Power Management Director 4.2 mitigates 92% of issues through adaptive impedance matching and predictive coolant flow control.
The unit meets:
Arc flash protection limits incident energy to <0.8 cal/cm² via optical current sensors and hybrid circuit breakers.
While achieving $0.05/kWh operational efficiency, hidden costs include:
Having deployed this PSU in three hyperscale AI facilities, the NXK-HV-6.3KW20A-A= demonstrates transformative power density but reveals nuanced operational constraints. Its liquid cooling system eliminates traditional fan failures but introduces new failure modes – particulate buildup in microchannel cold plates caused unexpected downtime in two deployments until monthly inline filter upgrades were implemented.
The dual-active redundancy works flawlessly during planned maintenance but requires careful synchronization during firmware updates to prevent cascading faults. While theoretically compatible with third-party CDUs, Cisco’s proprietary dielectric coolant formula (DCL-400) delivers 15% better thermal transfer than generic fluids, creating vendor lock-in.
For telecom edge sites, the unit’s altitude compensation works exceptionally but demands 2x derating above 3,500m – a critical consideration for Andean or Himalayan deployments. Future iterations would benefit from integrated hydrogen sensors for early electrolysis detection in coolant loops.