Updated May 2026 • AI-Verified • Compatibility Checked
Best $5,000 PC Build for Workstation at 1440P (Intel + NVIDIA) – Mini-ITX
This compact powerhouse delivers top-tier workstation performance in a sleek Mini-ITX form factor, featuring Intel's latest Core Ultra 9 and NVIDIA's flagship RTX 5090. Designed for professionals demanding uncompromising power and efficiency for demanding tasks at 1440p and beyond.
Socket Match
DDR Match
PSU Capacity
Chassis Clearance
$4,690
Target Budget: $5,000
Expected Real-World Capability
How this configuration handles real-world workloads, based on its specs, thermal tolerances, and price tier.
✓
Professional Workloads
Optimized for high-compute rendering tasks, 3D modeling (Blender, Unreal Engine), software compilations, or local AI inference.
✓
Deep Stability Margin
Sustained peak speeds under 100% compute load with robust VRM power delivery and high-end power efficiency.
✓
GPU Acceleration
CUDA or OpenCL capabilities boost graphics-accelerated applications and preview screens in real-time.
Complete Build Checklist
A quick overview of all 8 components and pricing. Click any part to view details or check live Amazon prices.
| Component | Model Name & Role | Est. Price | Retail Price |
|---|---|---|---|
|
CPU |
Intel Core Ultra 9 285K
Primary Processor
|
$700 |
View on Amazon → |
|
GPU |
NVIDIA GeForce RTX 5090
Graphics Card
|
$2,200 |
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|
Motherboard |
ASUS ROG Strix Z890-I Gaming WiFi
Mainboard
|
$480 |
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|
Memory |
G.Skill Trident Z5 RGB 64GB (2x32GB) DDR5-6800 CL34
RAM
|
$400 |
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|
Storage |
Samsung 990 Pro 4TB NVMe PCIe 4.0 SSD
Primary Storage
|
$350 |
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|
PSU |
Corsair SF1000L 1000W 80+ Gold SFX-L
Power Supply Unit
|
$250 |
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|
CPU Cooler |
NZXT Kraken 240 RGB AIO Liquid Cooler
CPU Cooling
|
$150 |
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|
Case |
Lian Li A4-H2O Mini-ITX Case
Chassis
|
$160 |
View on Amazon → |
| Estimated Build Total | $4,690 |
Shop Setup on Amazon → |
|
Component Deep Dive
Why we selected each of these 8 parts for this build and how they fit into the compatibility ecosystem.
Intel Core Ultra 9 285K
Primary Processor
A top-tier Intel Core Ultra processor offering exceptional multi-core performance and high clock speeds, ideal for demanding workstation applications like rendering, video editing, and complex simulations.
$700
Local pricing varies
NVIDIA GeForce RTX 5090
Graphics Card
The flagship NVIDIA GPU provides unparalleled performance for 1440p workstation tasks, including professional rendering, AI/ML development, and GPU-accelerated computing, ensuring maximum productivity.
$2,200
Local pricing varies
ASUS ROG Strix Z890-I Gaming WiFi
Mainboard
A premium Mini-ITX motherboard designed for the latest Intel Core Ultra CPUs, offering robust power delivery, advanced connectivity, and essential features for a high-performance compact workstation.
$480
Local pricing varies
G.Skill Trident Z5 RGB 64GB (2x32GB) DDR5-6800 CL34
RAM
64GB of high-speed DDR5 RAM is crucial for demanding workstation applications, providing ample memory bandwidth and capacity for multitasking and large datasets.
$400
Local pricing varies
Samsung 990 Pro 4TB NVMe PCIe 4.0 SSD
Primary Storage
A high-capacity and ultra-fast NVMe SSD ensures rapid boot times, quick application loading, and efficient handling of large project files, essential for a productive workstation.
$350
Local pricing varies
Corsair SF1000L 1000W 80+ Gold SFX-L
Power Supply Unit
A high-wattage, compact SFX-L power supply is necessary to reliably power the powerful Core Ultra 9 CPU and RTX 5090 GPU in a Mini-ITX build, ensuring stability and efficiency.
$250
Local pricing varies
NZXT Kraken 240 RGB AIO Liquid Cooler
CPU Cooling
An efficient 240mm AIO liquid cooler is essential for maintaining optimal temperatures for the high-performance Intel Core Ultra 9 285K, especially within the confines of a Mini-ITX case.
$150
Local pricing varies
Lian Li A4-H2O Mini-ITX Case
Chassis
A compact and well-designed Mini-ITX case that offers excellent compatibility for a 240mm AIO and a high-end GPU, providing good airflow in a small footprint, perfect for a workstation setup.
$160
Local pricing varies
System Compatibility Verification
Every full build passes a strict validation run before publication. Here are the status check reports:
CPU Socket Match
Verifies that the motherboard's socket (e.g. AM5 or LGA1851) matches the designated CPU precisely.
Verified
Memory Gen Match
Verifies that the CPU memory controller and motherboard slots support the same DDR standard (DDR4 or DDR5).
Verified
PSU Capacity
Ensures the chosen power supply capacity matches the cumulative peak load of the components with safety buffer.
Verified
Chassis Dimensions
Verifies that the motherboard layout fits the case, and GPU length/cooler height clear the internal chassis clearances.
Verified
This compact Mini-ITX build requires careful attention to component dimensions. The Lian Li A4-H2O case supports 240mm AIOs and GPUs up to 322mm in length, which accommodates the selected components.
Note: Cross-referencing specifications on product boxes during unboxing is always recommended before tearing open plastic wraps.
Compatibility Notes
This compact Mini-ITX build requires careful attention to component dimensions. The Lian Li A4-H2O case supports 240mm AIOs and GPUs up to 322mm in length, which accommodates the selected components.
Upgrade Path
This build is already at the pinnacle of current technology for a compact workstation. Future upgrades would likely involve next-generation GPUs or CPUs if your specific workloads demand even more processing power, assuming socket compatibility. Expanding storage with additional NVMe drives is also an option, though the 4TB included is substantial. For most users, this system will remain highly capable for many years.
Tradeoffs
Achieving this level of performance in a Mini-ITX form factor involves specific tradeoffs. The premium for compact components like the SFX-L PSU and ITX motherboard is higher than their ATX counterparts. While the 4TB NVMe PCIe 4.0 SSD is incredibly fast, a PCIe 5.0 drive could offer marginal gains in specific, extremely demanding I/O workloads, but at a higher cost. The compact case design, while aesthetically pleasing, can also limit extreme overclocking potential compared to larger cases with more airflow.
FAQ
Why choose a Mini-ITX form factor for such a high-performance workstation?
Choosing Mini-ITX allows for a significantly smaller footprint, making it ideal for desks with limited space or for professionals who need a powerful, portable workstation. It sacrifices some expandability but offers a clean, minimalist aesthetic.
Is the 240mm AIO sufficient to cool the Intel Core Ultra 9 285K?
Yes, the NZXT Kraken 240 RGB AIO is a capable cooler for the Intel Core Ultra 9 285K, especially within the Lian Li A4-H2O case which is designed to accommodate it. For typical workstation loads and gaming, it provides adequate thermal management.
Why was a PCIe 4.0 SSD chosen instead of a newer PCIe 5.0 model?
While PCIe 5.0 SSDs are available, the Samsung 990 Pro 4TB NVMe PCIe 4.0 SSD offers exceptional read and write speeds that are more than sufficient for the vast majority of workstation tasks and gaming. The performance difference in real-world scenarios for most users is negligible, while the PCIe 4.0 drive provides a better value.
Can this build also handle 4K gaming effectively?
Absolutely. While optimized for 1440p workstation tasks, the NVIDIA GeForce RTX 5090 is a flagship GPU designed to handle the most demanding games and applications at 4K resolution with high frame rates and ray tracing enabled.