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Black tower case with tempered glass side panel and RGB fans

Adamant Custom

Adamant Custom Ryzen 9 9900X 128GB 1TB NVMe 10TB HDD RTX A400 business desktop

SKU CH-Q8ZK-C0D76

Liquid-cooled workstation with a 12-core Ryzen 9 9900X, 128 GB DDR5, 1 TB NVMe plus 10 TB HDD, and an RTX A400 GPU

  • Screen sizeNo Screen
  • ProcessorAMD Ryzen 9 9000 Series
  • RAM capacity128 GB DDR5
  • SSD storage1 TB NVMe
  • GraphicsNvidia RTX A400
  • CPU modelAMD Ryzen 9 9900X
  • 12-core Ryzen 9 9900X handles heavy workloads
  • 128 GB DDR5 memory supports large datasets
  • 1 TB NVMe SSD plus 10 TB HDD stores projects fast
  • RTX A400 with four MiniDP outputs drives multiple displays
  • 240 mm liquid cooler keeps CPU temperatures low

Workstation for compute-heavy tasks

This Adamant Custom business desktop pairs a 12-core AMD Ryzen 9 9900X processor with 128GB of DDR5 memory and an Nvidia RTX A400 graphics card. The system ships with Windows 11 Pro and targets professionals who need strong multi-threaded performance for rendering, simulation or data-analysis workloads.

Sustained load with liquid cooling

A 240mm liquid cooler keeps the CPU at stable clocks during long compile jobs or overnight batches, while the 750W power supply delivers consistent power without thermal throttling. The Samsung 990 PRO NVMe drive maintains sequential reads up to 7450 MB/s and writes up to 6900 MB/s, so large project files stay responsive throughout extended sessions.

Check your display and peripheral needs

The RTX A400 provides four Mini DisplayPort outputs, so verify that your monitors accept this connector or budget for adapters. The motherboard offers USB4, 20Gbps, 10Gbps and 5Gbps ports plus 2.5G Ethernet and Wi-Fi 7; confirm your existing docks, storage enclosures and network gear can use these interfaces.

How it compares

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

Price $3,933.99
Cheaper than about 59% 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 1 TB NVMe
Lower than about 60% 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 storage1 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 loud does the 240 mm liquid cooler and the 140 mm PSU fan get under sustained load?

The CPU uses a 240 mm quiet-edition liquid cooler and the 750 W PSU has a 140 mm ultra-quiet fan, both designed for low noise during long workstation sessions.

Which display cables must I already own to connect monitors to the four Mini DisplayPort outputs on the RTX A400?

The RTX A400 provides four Mini DisplayPort connectors, so you need Mini DisplayPort cables or Mini DisplayPort-to-DisplayPort/HDMI adapters for each monitor you plan to attach.

Can the X870 motherboard still run my older SATA SSDs and 3.5-inch hard drives alongside the new NVMe boot drive?

Yes, the board includes two SATA 6 Gb/s ports and the case has two internal 3.5-inch bays, so legacy SATA drives install directly beside the 1 TB NVMe SSD.

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