RK4000
42U-50kW-80GPU Field-Ready Modular Data Center
- 42U Ruggedized Rack with 50kW Density
- High Density Compute Up to 80 GPU Per Rack
- Liquid Cooling Cold Plate Up to 15kW Per Server
- Integrated 150kW CDU & 5kW UPS
- Quick-Disconnect Liquid Manifolds
- Plug-and-Play Tactical Deployable, Logistically Sustainable
- Intel 6th Xeon-SP up to 144 Cores, Nvidia GPU up to 350W
- Dimension: 23.62 In (W) x 79.21 In (H) x 47.24 In (D)
- MIL-STD-810 for Extreme temperature, Vibration and Shock
- Technical Profile
- Specifications
- Order Information
- Introduction
-
7STARLAKE’s highly mobile, forward-deployed RK4000 Edge Modular Data Center (MDC) solution, powered by conduction-over-liquid-cooled AV2000 GPU servers, is purpose-built for operation in contested environments. Complemented by military-grade SN3420-D22 100G switches and ROC540 1120TB NAS servers, this integrated solution delivers assured low-latency compute and reliability at the point of need, directly enhancing mission effectiveness and operational survivability.
Based on modular units delivering approximately 250kW of IT load per module, the RK4000 is engineered to support dense, clustered compute environments required for modern military workloads. Each module is equipped with standardized but rugged heavy-metal 42U self-contained liquid cooled rack. Designed for computer clusters operating at target power densities of up to 50kW per rack, each rack supports 10 x AV2000 GPU Server, equipped with 1 x 50kW CDU, and enabling the deployment of GPU-accelerated systems, high-performance computing nodes, and AI platforms within a compact footprint.
RK4000
Configuration
Rack form factor 42U IT rack Rack count 5 racks Single Edge MDC module IT load
Approximately 250kW
Target rack density
50kW per rack
Recommended GPU server configuration
AV2000 3U conduction-over-liquid Cooled GPU servers,
approx. 4-5kW each
Estimated GPU server count per module
Approximately 50 GPU servers
CDU unit size
50kW ruggedized CDU
Minimum CDU count per 250kW module
1 unit
Aggregate envelope
Up to approximately 2MW using 8 interlinked modules
RK4000 (5 Racks, 250 kW)
- Standard Rack Architecture
-
The recommended architecture is a GPU-optimized but field-serviceable configuration using five 42U racks per Edge MDC module.
AV2000 GPU Server
ROC540 NAS Server
SN3420-D22 Switch
Elements (Per Rack)
Quantity
Description
3U liquid cooled AV2000 GPU servers
9 units
Approx. 4-5kW each; total approx. 40-50kW per rack
2U 48 Ports 100G SN3420-D22 switches
2 units
Redundant data/control networking; final U count depends on fabric design
3U 1120 TB Super Capacity ROC540
1 unit
NAS / AI dataset repository
4U 50kW Ruggedized CDU
1 unit
Liquid cooling distribution unit
4U UPS
1 unit
Power backup and surge protection
Management/control node
1-2 units
Out-of-band management, local orchestration, monitoring, and deployment services
Rack manifold and QD area
As required
Liquid supply/return headers with quick-disconnect couplings
Blanking panels / service reserve
As required
Maintains airflow discipline and field maintainability
- Ruggedized Conduction-Over-Liquid Cooling Architecture
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In pursuit of stability and high-performance computing, 7Starlake has optimized the thermal design of its Edge MDC architecture and introduced a unique heat exchanger integrating a Conduction-Over-Liquid-Cold Plate into the computing system. The unique cold plate features a multi-channel cold-water inlet/outlet design, offering high flexibility in configuring fluid paths (up to 4 in / 4 out). As coolant flows through the top sink, it rapidly absorbs heat from the source and transports it to the heat exchanger. The heated liquid is then cooled through 10 pipes (each pipe 10 mm x 10mm x p x 800mm) operating at 2K–3K RPM, ensuring continuous thermal regulation under sustained load.
Key features include:
- Unique heat exchanger integrating Conduction-Over-Liquid Cold Plate
- Multi-channel cold-water inlet/outlet configuration
- Gun-drilled Liquid Cooled Platform -10 pipes x 800 x 10 mm Pass (⌀ × L × H) enabling dissipation of up to 15 kW thermal load
Building on this foundation, the RK4000 implements a fully closed-loop, Conduction-Over-Liquid-Cooled, Direct-to-Chip (DTC) liquid cooling architecture that captures heat directly from the CPU die, GPU die, and DIMM modules. By eliminating the thermal resistance associated with traditional air-cooled heat sinks, the system enables sustained operation at rack densities beyond the limits of air cooling. This architecture is aligned with proven hyperscale liquid cooling topologies—such as Supermicro’s 42U rack-scale DTC solution validated at ISC 2024—while incorporating ruggedized components and manifold interfaces engineered for tactical field deployment.
Component
Technology
Key Characteristics
CPU Cold Plate
Micro-channel copper cold plate | Intel Xeon 6 SP socket interface
Lower thermal resistance than industry-standard heat sink specifications; micro-sized channels for high heat flux dissipation
GPU Cold Plate
GPU-specific cold plate | NVIDIA RTX PRO 6000 Blackwell form factor
Direct die-contact cooling; also captures heat from adjacent GPU power components and NVLink switch fabric
DIMM Thermal Module
DDR5 DIMM direct-contact thermal module
Reduces DIMM operating temperature; improves memory reliability and longevity under sustained high-bandwidth AI workloads
Coolant Distribution Manifold (CDM)
Vertical rack-mount CDM with per-bay QDC ports
Optimized flow distribution; one-handed QDC operation; liquid level and pressure sensors with sight glass; supports 42U rack configuration
Hose Kit / Facility Interface
1.25-inch flexible hose | Camlock QDC facility connection
10-bar pressure rated; ball valve sealing; universal camlock for direct facility water or cooling tower connection; 1 m / 2 m / 3 m / 5 m lengths available
Cooling Distribution Unit (CDU)
50 kW liquid-to-liquid heat exchanger | 4U integrated
N+1 pumps; 45°C max facility water; anti-condensation control; hot-swap pumps and PSUs; local and remote management
- Key IT Structures
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AV2000 | 3U Liquid-Cooled AI GPU Server
As the primary AI compute node within the RK4000 rack ecosystem, the 3U AV2000 liquid-cooled AI GPU server is built for sustained, high-performance operation. It features dual Intel® Xeon® 6 Scalable processors paired with an NVIDIA RTX PRO™ 6000 Blackwell GPU accelerator, interconnected via PCIe Gen 5 to maximize CPU–GPU bandwidth. Its conduction-over-liquid cooling architecture transfers heat directly from CPU and GPU cold plates and DIMM thermal modules into the rack CDU loop, eliminating hot spots and ensuring consistent full-performance operation independent of ambient conditions.
ROC540 | 3U High-Capacity NAS
The ROC540 NAS Server is a high-capacity, all-flash storage platform engineered for mission-critical data center and military edge environments. Powered by dual Intel® 6th Generation Xeon® Scalable processors, it provides up to 1,120 TB of usable capacity with low latency and high throughput. Its NAS-optimized design supports efficient storage consolidation and simplified management, while enabling forward-deployed and battlefield edge use cases such as ISR data aggregation, AI-driven analytics, and mission-critical data access in bandwidth-constrained operations.
SN3420-D22 | 2U 100G AI Fabric Switch
The SN3420-D22 is a high-performance 2U AI fabric switch designed for military edge where resilient, low-latency networking is mission critical. Equipped with 48 × 25GbE SFP28 downlinks and 8 × 100GbE QSFP28 uplinks, it delivers 3.2 Tbps of non-blocking switching capacity with RDMA and RoCEv2 support for GPU-to-GPU AI traffic. In dual-switch active-active configurations, the SN3420-D22 provides a redundant, high-availability fabric for tactical data centers, enabling real-time sensor fusion, AI inference, and secure data movement across battlefield edge systems.
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RK4000 Rack System Overview |
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|---|---|---|---|---|
| Component | Model | Rack U | Qty | Description |
|
GPU Compute Server |
AV2000 |
3U |
× 9
|
Liquid-cooled AI GPU server; Conduction-Over-Liquid-Cooling; 4–5 kW per node |
|
Network Switch |
SN3420-D22 |
2U |
× 2 |
100G AI fabric switch; 48 × 25GbE + 8 × 100GbE QSFP28; dual-redundant configuration |
|
NAS Storage |
ROC540 |
3U |
× 1 |
1,120 TB raw NAS; AI dataset repository; high-throughput NVMe-backed storage |
|
Cooling Distribution Unit |
50 kW Ruggedized CDU |
4U |
× 1 |
Liquid-to-liquid heat exchange; N+1 pump redundancy; QDC manifold connections; hot-swappable |
|
Integrated UPS |
Industrial UPS |
4U |
× 1 |
Backup power and surge protection; generator-compatible; field-deployable ruggedized |
|
Coolant Distribution Manifold |
Vertical CDM |
Integrated |
× 1 |
Vertical CDM with QDC connections per rack bay; optimized coolant flow distribution to all compute nodes |
|
AV2000 Liquid-Cooled GPU Server |
|
|---|---|
| Form Factor | 3U Rackmount | Tool-less rail-mount slide |
|
Processor |
Dual Intel® Xeon® 6 6760P | Granite Rapids SP | PCIe Gen 5 | DDR5-6400 |
|
Core / Thread Count |
Up to 144 Cores / 288 Threads (dual socket) |
|
Memory |
DDR5-6400 RDIMM ECC | Up to 8 TB addressable system memory |
|
GPU Accelerator |
NVIDIA RTX PRO™ 6000 Blackwell | PCIe Gen 5 x16 | 96 GB GDDR7 |
|
Storage Interface |
U.2 PCIe Gen 5.0 × 4 NVMe | MCIO × 8 breakout to dual SFF-8639 (85-ohm) |
|
Networking |
Dual 100GbE QSFP28 (NVIDIA ConnectX or equivalent) | 1GbE OOB management |
|
Cooling Method |
Conduction-over-liquid Direct-to-Chip (DTC) | CPU cold plate + GPU cold plate + DIMM thermal module |
|
Estimated Node Power |
4–5 kW per server (sustained AI compute load) |
|
Coolant Interface |
Quick-Disconnect Couplings (QDC) | Integrates with rack vertical CDM |
|
Deployment Use Case |
AI training / AI inference / HPC / real-time ISR processing |
|
SN3420-D22 Military Switch |
|
|---|---|
| Form Factor | 2U Rackmount |
|
Port Configuration |
48 × 25GbE SFP28 (server / storage downlinks) | 8 × 100GbE QSFP28 (uplinks / inter-switch) |
|
Switching Capacity |
3.2 Tbps non-blocking | RDMA / RoCEv2 support for GPU-to-GPU AI traffic |
|
Configuration |
Dual-switch deployment (2 × SN3420-D22) | Active-active redundant fabric |
|
Management |
In-band and out-of-band management | Industry-standard SNMP / REST API |
|
Cooling |
Integrated fan cooling | Front-to-rear airflow |
|
ROC540 3U High-Capacity NAS Server |
|
|---|---|
| Form Factor | 3U Rackmount |
|
Raw Capacity |
1,120 TB |
|
Primary Use |
AI dataset repository | Model checkpoint storage | ISR data archive |
|
Interface |
High-throughput NAS / NVMe-oF | 10GbE / 25GbE network connectivity |
|
Redundancy |
RAID-protected storage pools | Hot-spare drives |
|
50kW Ruggedized CDU |
|
|---|---|
| Form Factor | 4U Rackmount | Integrated within RK4000 chassis |
|
Cooling Capacity |
50kW (rated) | Scalable with external CDU for expanded rack deployments |
|
Cooling Type |
Liquid-to-liquid heat exchange | Primary loop: internal rack coolant | Secondary loop: facility water |
|
Maximum Facility Water Inlet Temperature |
Up to 45°C — reducing dependency on chilled facility water |
|
Pump Configuration |
N+1 redundant pumps | Hot-swap replacement in under 2 minutes |
|
PSU Configuration |
Redundant hot-swappable PSUs | Field-replaceable in under 1 minute |
|
Coolant Interface |
Quick-Disconnect Couplings (QDC) at rack manifold | 1.25-inch hose kit connections |
|
Manifold Type |
Vertical Coolant Distribution Manifold (CDM) with per-bay QDC | One-handed coupling operation |
|
Leak Detection |
Integrated liquid level and air pressure sensors | Sight glass for visual inspection |
|
Anti-Condensation |
Automatic condensation prevention control — no manual intervention required |
|
Redundancy Mode |
Supports N+1 CDU configuration across multiple rack deployments |
|
Management |
Local LCD touch panel | Remote access via network management interface |
|
Deployment |
Ruggedized tactical field operation | Generator-compatible | Designed for sustained unprepared-site deployment |
|
Integrated UPS |
|
|---|---|
| Form Factor | 4U Industrial-Grade Rackmount UPS |
|
UPS Topology |
Online double-conversion | Sub-10 ms transfer time on generator switching event |
|
Function |
Backup power ride-through | Transient suppression | Surge protection |
|
Input Compatibility |
Utility / Generator-compatible | Wide input voltage and frequency acceptance |
|
Generator Interface |
MEP-series military generator compatible | Tolerant of generator-grade power quality |
|
Battery Chemistry |
Industrial-grade sealed VRLA or LiFePO4 (configuration-dependent) |
|
Deployment |
Field-deployable ruggedized operation | Designed for mobile and tactical environments |
|
Product Model |
RK4000 |
|
Configuration |
Fully integrated rack solution | Custom configurations available on request |
|
Lead Time |
Subject to order volume and configuration; contact sales for current lead time |
|
NRE / Customization |
Non-Recurring Engineering (NRE) available for MIL-STD power input variants, TEMPEST treatment, and SCRM-compliance documentation |
|
Company |
7STARLAKE CO., LTD. |
|
Product Line |
Edge MDC / Tactical AI Infrastructure |
|
Documentation |
Full ICD, mechanical drawings, and thermal validation reports available under NDA upon request |
