Best PSU for Core Ultra 7 265K & RTX 5090
This build is an enthusiast-grade powerhouse, capable of handling all current and future AAA games at maximum settings, high refresh rates, and resolutions up to 8K, alongside demanding professional workloads.
1200W
825W
69%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1200W target — sorted by overall value.
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
Excellent value with ATX 3.1/PCIe 5.1 readiness and Cybenetics Platinum efficiency for this high-end system.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$119.89
be quiet! Pure Power 12 M 1200W Modular Power Supply | 80 Plus® Gold | ATX 3.1 | PCIe 5.0 GPUs and 6+2 pin connectors | 12VHPWR Cable Included | Silent 120mm be quiet! Fan – BN513 I 10 Year Warranty
Reliable, quiet operation with ATX 3.1/PCIe 5.0 compliance, perfect for a powerful and silent enthusiast build.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$174.90
Corsair RM1200x Shift Fully Modular ATX Power Supply – Side Interface – ATX 3.1 & PCIe 5.1 Compliant – Zero RPM Fan Mode – 105°C-Rated Capacitors – 80 Plus Gold Efficiency – Black
Innovative side-interface design, ATX 3.1/PCIe 5.1, and top-tier components suit high-performance builds with specific case needs.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$194.99
be quiet! Straight Power 12-1500w Modular Power Supply | 80 Plus Platinum ATX 3.1 Compliant | for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors | Silent 135mm Fan | BN518
Want extra headroom for future GPU upgrades or overclocking? This 1500W unit gives you peace of mind.
Efficiency80+ Gold
FormATX
CablesNon-Modular
Price$286.64
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | 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 | 1200W | 80+ Gold | Full-Modular | $119.89 |
| 2 | be quiet! Pure Power 12 M 1200W Modular Power Supply | 80 Plus® Gold | ATX 3.1 | PCIe 5.0 GPUs and 6+2 pin connectors | 12VHPWR Cable Included | Silent 120mm be quiet! Fan – BN513 I 10 Year Warranty | 1200W | 80+ Gold | Full-Modular | $144.90 |
| 3 | Corsair RM1200x Shift Fully Modular ATX Power Supply – Side Interface – ATX 3.1 & PCIe 5.1 Compliant – Zero RPM Fan Mode – 105°C-Rated Capacitors – 80 Plus Gold Efficiency – Black | 1200W | 80+ Gold | Full-Modular | $194.99 |
| ⬆️ | be quiet! Straight Power 12-1500w Modular Power Supply | 80 Plus Platinum ATX 3.1 Compliant | for PCIe 5.0 GPUs and GPUs with 6+2 pin connectors | Silent 135mm Fan | BN518 Upgrade | 1500W | 80+ Gold | Non-Modular | $260.91 |
🔌 Power Budget
Your system uses 69% of the recommended PSU output — well within the efficient operating range.
1200W (Recommended)
System draw: 825W
Headroom: 375W (30%)
💡 Why 1200W?
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
Enable GPU's power-saving features.
Utilize CPU's efficiency cores.
Optimize fan curves for cooling efficiency.
🎯 What This Build Can Do
Extreme Gaming
Experience unparalleled 8K gaming with ray tracing and ultra settings in demanding titles.
Pro Video Editing
Render 4K/8K video, apply complex effects, and perform real-time playback with ease.
AI/ML Development
Train large AI models, run complex simulations, and accelerate data science workloads.
🔧 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 5090 — no daisy-chaining.
- Boot-test with side panel open before final assembly.
⚠️ Special Note
Ensure ample case clearance for PSU and cable management, especially for side-interface models.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.