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Black mid-tower desktop with liquid cooling visible through side panel

Adamant Custom

Adamant Custom Workstation Ryzen 9 9900X 128GB 4TB NVMe 10TB HDD RTX A400 Liquid Cooled

SKU CH-BJ6S-TMFXB

Liquid-cooled business workstation with a 12-core Ryzen 9 9900X, 128 GB DDR5, 4 TB NVMe, 10 TB HDD and RTX A400 graphics for AI-ready workloads

  • Screen sizeNo Screen
  • ProcessorAMD Ryzen 9 9000 Series
  • RAM capacity128 GB DDR5
  • SSD storage4 TB NVMe
  • GraphicsNvidia RTX A400
  • CPU modelAMD Ryzen 9 9900X
  • 12-core Ryzen 9 9900X powers demanding workloads
  • 128GB DDR5 memory handles large datasets smoothly
  • 4TB NVMe SSD plus 10TB HDD stores massive projects
  • RTX A400 with four MiniDP outputs drives multiple displays
  • 240mm liquid cooler keeps CPU temperatures low

Workstation Ryzen 9 9900X 128GB DDR5

This business desktop is built as a workstation around a 12-core AMD Ryzen 9 9900X processor running at 4.4 GHz with up to 5.20 GHz boost and 96 MB L3 cache. It ships with 128 GB of DDR5 memory and a 240 mm liquid cooler on an X870 TUF motherboard. The system includes Windows 11 Pro 64-bit and is marked AI Ready.

Suits multi-monitor professional workloads

Four Mini DisplayPort outputs on the Nvidia RTX A400 4 GB card drive multiple displays for design, visualization or trading setups. The 4 TB NVMe SSD and 10 TB hard drive provide fast boot and large local storage. Buyers who need more GPU memory or additional internal drive bays should consider a different configuration.

4 TB Samsung 990 PRO NVMe SSD

The primary drive is a 4 TB Samsung 990 PRO PCIe 4.0 x4 NVMe SSD with sequential reads up to 7450 MB/s and writes up to 6900 MB/s. This capacity and speed determine whether the system can hold active project files and scratch space without a secondary NVMe drive.

How it compares

Measured against everything we stock in Business & Office Desktops, at today’s prices. Recalculated every night.

Price $3,983.99
Cheaper than about 58% of the 2,161 comparable items (median $5,687.99).
RAM capacity 128 GB DDR5
Higher than about 60% of the 2,095 comparable items (median 64 GB).
SSD storage 4 TB NVMe
Higher than about 70% of the 2,058 comparable items (median 2 TB).

Specifications

Product
Year of release2026
Product typeBusiness Desktops & Workstations
Recommended useWorkstation
Product colorBlack
Processor
ProcessorAMD Ryzen 9 9000 Series
CPU modelAMD Ryzen 9 9900X
CPU socketAM5
Memory
RAM capacity128 GB DDR5
Max supported RAM192 GB
Storage
SSD storage4 TB NVMe
Hard drive10 TB
Optical driveNo
Display
Screen sizeNo Screen
Graphics
GraphicsNvidia RTX A400
GPU interfacePCI Express x16
VR readyYes
Audio & video
Sound channels7.1 channels
Connectivity
Wi-Fi standardWi-Fi 7
Network speed2.5 Gbit/s
Wired network2.5G Ethernet
Ethernet controllerIntegrated
Wi-Fi802.11be Wireless LAN
Bluetooth support5.4
Ports & slots
Ethernet port1 port
Size & build
Form factorDesktop
In the box
Included monitorNot included
Software
Operating systemWindows 11 Pro 64-bit
More details
Cooling methodLiquid Cooling
AI capabilityAI Ready

Questions about this item

How do I install the 240 mm AIO liquid cooler on the AM5 socket and what step is often missed?

Mount the AM5 bracket supplied with the cooler, apply thermal paste, secure the cold plate, then connect the pump header and both fan headers to the X870 motherboard — the pump header is the step most builders forget.

Which components will need replacement first during the workstation's service life?

The 750 W 80 PLUS Bronze PSU and the 140 mm PSU fan are the earliest wear items; the AIO pump may require attention after several years of continuous operation.

What thermal limit appears first when the Ryzen 9 9900X runs sustained all-core workloads?

The 240 mm AIO reaches its heat-dissipation ceiling before the CPU hits its 5.20 GHz boost, causing clock speeds to settle below the maximum turbo frequency.

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