Best PSU for Core Ultra 9 285KF & RTX 4090
This enthusiast-grade build delivers peak 4K gaming performance and excels in demanding professional creative workloads.
1000W
675W
68%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1000W target — sorted by overall value.
CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector u2013 Black
High-quality capacitors and native ATX 3.1 support ensure stable 4090 power.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$179.99
msi MAG A1000GL PCIE5, Fully Modular Compact Gaming 1000W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty
Dual-color connector helps verify the cable is safely and fully inserted.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$134.99
be quiet! Pure Power 13 M 1000W Power Supply, 80 Plusu00ae Gold Certification, ATX 3.1 PSU, Support for PCIe 5.1 GPUs, semi-Passive 120mm be quiet! Fan, LLC Technology, Single Rail, for Overclocked GPUs
Solid ATX 3.1 performance, though non-modular cables require more space.
Efficiency80+ Gold
FormATX
CablesNon-Modular
Price$139.90
MONTECH Century II – 1200W High-End ATX Gaming Power Supply – 80 Plus Gold & Cybenetics Platinum – Fully Modular – ATX 3.1 & PCIe 5.1 Ready with 12V-2×6 Cable – 10 Years Warranty
Want extra headroom for future GPU upgrades or overclocking? This 1200W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$129.90
Amazon.com prices as of 03/23/2026 18:24 GMT+0000 —
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply u2013 Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector u2013 Black | 1000W | 80+ Gold | Full-Modular | $179.99 |
| 2 | msi MAG A1000GL PCIE5, Fully Modular Compact Gaming 1000W Power Supply, 80+ Gold, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, 10 Year Warranty | 1000W | 80+ Gold | Full-Modular | $134.99 |
| 3 | be quiet! Pure Power 13 M 1000W Power Supply, 80 Plusu00ae Gold Certification, ATX 3.1 PSU, Support for PCIe 5.1 GPUs, semi-Passive 120mm be quiet! Fan, LLC Technology, Single Rail, for Overclocked GPUs | 1000W | 80+ Gold | Non-Modular | $139.90 |
| ⬆️ | MONTECH Century II – 1200W High-End ATX Gaming Power Supply – 80 Plus Gold & Cybenetics Platinum – Fully Modular – ATX 3.1 & PCIe 5.1 Ready with 12V-2×6 Cable – 10 Years Warranty Upgrade | 1200W | 80+ Gold | Full-Modular | $129.90 |
🔌 Power Budget
Your system uses 68% of the recommended PSU output — well within the efficient operating range.
1000W (Recommended)
System draw: 675W
Headroom: 325W (30%)
💡 Why 1000W?
Power Calculation
CPU + GPU draw, plus ~100W for motherboard, RAM, fans, and storage.
30% Headroom
Extra capacity absorbs transient power spikes, keeps efficiency in the sweet spot, and leaves room for future upgrades.
80 Plus Efficiency
We only recommend certified PSUs. Higher ratings mean less wasted energy, lower heat, and quieter fans.
🌿 Power Efficiency Tips
Use the native 12V-2×6 cable for optimal power delivery.
Ensure adequate case airflow to manage high thermal output.
🎯 What This Build Can Do
4K Ultra Gaming
Maximize frame rates at 4K resolution with ray tracing and DLSS 3.5 enabled.
Professional Production
Seamless 8K video editing and complex 3D rendering in applications like Blender.
AI Development
Train large language models and run local generative AI workloads with 24GB VRAM.
🔧 Installation Guide
Quick Checklist
- Mount the PSU with its fan aligned to your case airflow.
- Only connect cables you actually need (modular PSUs).
- Use dedicated PCIe power cables for NVIDIA GeForce RTX 4090 — no daisy-chaining.
- Boot-test with side panel open before final assembly.
⚠️ Special Note
Fully seat the 12V-2×6 connector until it clicks to prevent port melting.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.