Best PSU for Core Ultra 7 265KF & RTX 4090
This high-end configuration effortlessly handles 4K gaming at maximum settings, professional 3D rendering, and intensive AI workloads with significant thermal and power headroom.
1000W
675W
68%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1000W target — sorted by overall value.
be quiet! Pure Power 13 M 1000W Power Supply, 80 Plus® 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
The be quiet! Pure Power 13 M 1000W is a robust choice for the Intel Core Ultra 7 265KF and RTX 4090, leveraging its ATX 3.1 compliance to handle the transient spikes inherent to high-end gaming. While it lacks full modularity, its LLC topology ensures tight voltage regulation under heavy load. The 120mm fan remains whisper-quiet during intensive rendering tasks, making it an ideal candidate for users prioritizing acoustic performance in their high-wattage workstation builds.
- ATX 3.1 and PCIe 5.1 compliance ensures native 12V-2×6 support for the RTX 4090
- LLC technology provides excellent voltage stability for the power-hungry Core Ultra 7 265KF
- Optimized fan curve maintains near-silent operation even during sustained heavy gaming loads
- Non-modular design complicates cable management in compact or windowed PC cases
- Lack of fully modular cabling limits options for custom sleeved cable replacements
Efficiency80+ Gold
FormATX
CablesNon-Modular
Price$139.90
Auotac 1000W Fully Modular Power Supply, 80+ Gold PSU, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, RGB Low-Noise Smart Fan, 105°C-Rated Capacitors, Black
The Auotac 1000W brings a feature-rich approach to the Core Ultra 7 265KF and RTX 4090 pairing, utilizing high-quality 105°C-rated capacitors for long-term durability. Its fully modular design simplifies the installation process, while the native 12V-2×6 cable eliminates the need for bulky adapters. The inclusion of an RGB smart fan adds a distinct aesthetic flair, though users should ensure their chassis has sufficient airflow to complement the unit's thermal management profile.
- Fully modular architecture allows for clean cable routing with the RTX 4090
- 105°C-rated capacitors provide enhanced thermal headroom for overclocked CPU and GPU configurations
- Native 12V-2×6 cable ensures a secure, high-current connection for modern NVIDIA graphics cards
- RGB fan integration may not appeal to users seeking a strictly professional aesthetic
- Brand recognition is lower compared to established tier-one power supply manufacturers
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$99.99
CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply – Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector – Black
The Corsair RM1000x stands as the gold standard for the Core Ultra 7 265KF and RTX 4090, offering exceptional build quality and Cybenetics Gold efficiency. Its fully modular design and native 12V-2×6 support provide a clean, future-proof foundation for high-end builds. With a proven track record for transient load handling, this unit reliably manages the aggressive power draw of the RTX 4090 while maintaining a quiet, efficient operation under extreme system stress.
- Cybenetics Gold efficiency rating ensures minimal power waste during high-load gaming sessions
- Industry-leading transient response handles the RTX 4090 power spikes with significant stability
- Fully modular design facilitates effortless cable management for complex high-end system builds
- Premium pricing reflects its high-end build quality compared to budget-oriented 1000W alternatives
- The physical dimensions of the chassis may be tight in smaller ATX enclosures
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$119.30
ASUS ROG Strix 1200W Platinum (Fully Modular Power Supply, 80 Plus Platinum Certified, ATX 3.1, GaN MOSFET, GPU-First Intelligent Voltage Stabilizer, 10-Year Warranty)
The ASUS ROG Strix 1200W Platinum is an elite upgrade for an Intel Core Ultra 7 265KF and RTX 4090 pairing, providing significant thermal and electrical headroom for aggressive overclocking. By utilizing advanced GaN MOSFET technology and full ATX 3.1 compliance, this unit effortlessly manages the severe transient spikes inherent to high-end Ada Lovelace GPUs. The 1200W capacity ensures the system operates well within the peak efficiency curve, guaranteeing long-term stability and silent operation under heavy gaming loads.
- ATX 3.1 certification ensures native 12V-2×6 support for secure, high-wattage power delivery to the RTX 4090.
- GaN MOSFETs significantly reduce heat output and improve efficiency compared to traditional silicon-based power components.
- Generous 1200W ceiling provides substantial overhead for transient spikes and future-proofs against next-generation GPU power requirements.
- The premium price point reflects the high-end component selection, which may exceed the budget of value-oriented builders.
- The physical chassis dimensions are larger than standard ATX units, potentially complicating cable management in compact mid-tower cases.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$254.99
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | be quiet! Pure Power 13 M 1000W Power Supply, 80 Plus® 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 |
| 2 | Auotac 1000W Fully Modular Power Supply, 80+ Gold PSU, ATX 3.1 & PCIe 5.1 Ready, Native Dual-Color 12V-2×6 Cable, RGB Low-Noise Smart Fan, 105°C-Rated Capacitors, Black | 1000W | 80+ Gold | Full-Modular | $89.99 |
| 3 | CORSAIR RM1000x ATX 3.1 PCIe 5.1 Ready Fully Modular 1000W Power Supply – Low-Noise, Cybenetics Gold Efficiency, Native 12V-2×6 Connector – Black | 1000W | 80+ Gold | Full-Modular | $174.99 |
| ⬆️ | ASUS ROG Strix 1200W Platinum (Fully Modular Power Supply, 80 Plus Platinum Certified, ATX 3.1, GaN MOSFET, GPU-First Intelligent Voltage Stabilizer, 10-Year Warranty) Upgrade | 1200W | 80+ Gold | Full-Modular | $254.99 |
🔌 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
Ensure the PSU is mounted with the fan facing the case intake.
Use native 12V-2×6 cables to avoid potential adapter-related resistance or heat issues.
🎯 What This Build Can Do
4K Ultra Gaming
Maximum fidelity gaming at 4K resolution with ray tracing enabled for demanding titles.
Professional Rendering
Heavy 3D rendering and video production workloads utilizing full multi-core and GPU acceleration.
AI Development
Local LLM inference and machine learning training tasks requiring sustained high-power GPU performance.
🔧 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
Ensure the 12V-2×6 connector is fully seated until a distinct click is heard.
See PSU recommendations for other CPU + GPU combinations.
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