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WinFast GS4855 ST

  • Optimized for AI/Deep Learning GPU peering
  • Supports 10 double-wide GPU cards
  • Single Root System with excellent GPU peer to peer communication

Key Features

  • Single AMD EPYC 9004 Series Processor (Socket SP5)
  • 12 DIMMs, up to 3TB 3DS ECC DDR5-4800MHz RDIMM/LRDIMM
  • 12 PCIe 5.0 x16 FHFL slot(s)
  • Support Up to 10 GPU cards
  • Dual LAN with 10GbE RJ45
  • 24x Hot-swap SATA/SAS/NVMe 2.5" drive bays (8x NVMe drives supported by default)
  • 4x 2000W(2+2) Redundant Power Supplies,  Titanium Level (96%)

Multiple GPU support

AMD EPYC 9004 series processors

4th Gen AMD EPYC processors are on the cutting edge of server processor technology, with up to 128 cores based on a 5nm process. Supporting those cores is 1MB se cores is 1MB per core of L2 Cache, and 32MB per CCD of L3 cache, along with 12 DDR5 channels supporting up to 6TB of memory, CXL™ memory expansion, and PCIe® 5.0 support, offering up to 128 lanes of high bandwidth for the latest graphics and storage technologies.


Cooling System

High efficiency cooling system-5x Heavy duty fans with Optimal Fan Speed Control, for less power and ensure a stable environment and availability 24/7.

System Health Monitoring

The system has an onboard Baseboard Management Controller (BMC)
chip that supports system health monitoring.

Onboard Voltage Monitors

The onboard voltage monitor will continuously scan crucial voltage levels. Once a voltage becomes unstable, it will give a warning or send an error message to the IPMI WebGUI and IPMIView. Real time readings of these voltage levels are all displayed in IPMI.

Environmental Temperature Control

System Health sensors in the BMC monitor the temperatures and voltage settings of onboard processors and the system in real time via the IPMI interface. Whenever the temperature of the CPU or the system exceeds a user-defined threshold, system/CPU cooling fans will be turned on to prevent the CPU or the system from overheating.

Fan Status Monitor with Firmware Control

The system health monitor embedded in the BMC chip can check the RPM status of the cooling fans. The CPU and chassis fans are controlled via lPMI.

System Resource Alert

This feature is available when used with SuperDoctor 5. SuperDoctor 5 is used to notify the user of certain system events. For example, you can configure SuperDoctor 5 to provide you with warnings when the system temperature, CPU temperatures, voltages and fan speeds go beyond a predefined range3.




Model, simulate, test, and improve products like never before. With WinFast Workstation manufacturers can design and bring innovative products to market faster.
Media & Entertainment

Media & Entertainment

From pre-vis to post-production, the industry's most critically-acclaimed feature films require the latest technological advancements. WinFast Workstation works behind the scenes giving you the precision and power to tell remarkable stories.

Architecture, Engineering and Construction

Workflows in the architecture, engineering, and construction (AEC) space are in transformation. Leading-edge technologies, powered by WinFast Workstation , are enabling AEC teams to optimize design workflows and build for the future.

AI Applications



Ad Personalization Click Through Rate Optimization Churn Reduction.


Sensor Data Tag Mapping Anomaly Detection Robust Fault Prediction.


Claim fraud Customer Service Chatbots/Routing Risk Evaluation.


Remaining Useful Life Estimation Failure Prediction Demand Forecasting.


Improve Clinical Care Drive Operational Effeciency Speed Up Drug Discovery.


Detect Network/Security/Anomalies Forecasting Network Performance Network Resource Optimization (SON).


Supply Chain and Inventory Management Price Management/Markdown Optimization Promotion Prioritization and Ad Targeting.


Personalization & Intelligent Custoemr Interactions Connected Vehicle Predictive Maintenance Forecasting, Demand and Capacity Planning.
Smart Home


AI Speaker, Lighting, Security AI Appliances, Thrtmostat AI Vauums.


  • Single Socket SP5 AMD EPYC 9004 Series Processor
  • Up to 128 Core/256 Thread
  • Support up to TDP 400W

System Memory

Memory Capacity
  • 12x DIMM slots
  • Up to 3TB: 12x 256 GB DRAM
Memory Type 4800 MHz ECC DDR5 RDIMM/LRDIMM

On-Board Devices

Chipset AMD SP5
SATA SATA3 (6Gbps)
Network 2x 10GbE BaseT
  • Support for Intelligent Platform Management Interface v.2.0
  • IPMI 2.0 with virtual media over LAN and KVM-over-LAN support

Input / Output

SATA 2x SATA3 (6Gbps) ports
  • 2x RJ45 10GBase-T ports
  • 1x RJ45 Dedicated IPMI LAN port
USB 2x USB 3.0 ports
Video 1x VGA port

Form Factor

4U Rackmountable with Rail kit


Height 7.0" (178mm)
Width 17.2" (437mm)
Depth 29" (737mm)
  • Net Weight: 65.5 lbs (29.7 kg)
  • Gross Weight: 100 lbs (45.3 kg)

Drive Bays / Storage

24x 2.5" hot-swap NVMe/SATA/SAS drive bays (8x 2.5" NVMe and 2x SATA drives supported by default)

Expansion Slots

PCI-Express 12 PCIe 5.0 x16 FHFL slot(s)

System Cooling

Fans 8 heavy duty fans with optimal fan speed control

Power Supply

Power Supply 4x 2000W Redundant (2+2) Titanium level power supplies with PMBus
AC Input 1000W: 100-127Vac / 50-60Hz
1800W: 200-220Vac / 50-60Hz
1980W: 220-230Vac / 50-60Hz
2000W: 220-240Vac / 50-60Hz (for UL only)
2000W: 230-240Vac / 50-60Hz
2000W: 230-240Vdc / 50-60Hz (for China only)
+12V Max: 83A / Min: 0A (100Vac-127Vac)
Max: 150A / Min: 0A (200Vac-220Vac)
Max: 165A / Min: 0A (220Vac-230Vac)
Max: 166A / Min: 0A (230Vac-240Vac)
12V SB Max: 3.5A

OS Compatibility

  • Windows Server 2022
  • RHEL 9.0
  • Ubuntu 22.04/20.04

Operating Environment

RoHS RoHS Compliant
Environmental Spec.
  • Operating Temperature: 10°C ~ 35°C (50°F ~ 95°F)
  • Non-operating Temperature: -40°C to 60°C (-40°F to 140°F)
  • Operating Relative Humidity: 8% to 90% (non-condensing)
  • Non-operating Relative Humidity: 5% to 95% (non-condensing)

  • Revised web page of product spec and information won't be noticed, product colorbox printing shows the actual information of the product.
  • Above product spec is for reference only, actual spec rely on the real product and Leadtek keeps the right to alter. Each sales region will impacts the product difference, please contact your supplier for making sure the actual product information.
  • The adapter, cable and software listed on the web page are for reference only and Leadtek keeps the right to alter, revised information won't be noticed.
  • Above brand name and product name are trademark of each corresponding company.