Best PSU for Core i7-12700K & RTX 5090
This enthusiast build handles 4K ultra gaming and heavy workstation tasks with maximum performance.
1200W
825W
69%
Enthusiast
🏆 Recommended Power Supplies
Hand-picked for your 1200W target — sorted by overall value.
Corsair RM1200x Shift Fully Modular ATX Power Supply – Side Interface – ATX 3.1 & PCIe 5.1 Compliant – Zero RPM Fan Mode – 105u00b0C-Rated Capacitors – 80 Plus Gold Efficiency – Black
Side connectors simplify routing; ATX 3.1 ensures 5090 compatibility.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$194.99
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
Cybenetics Platinum efficiency with native 12V-2×6 cable support.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$129.90
ASUS TUF Gaming 1200W Gold (1200 Watt, ATX 3.0 Compatible Fully Modular Power Supply, 80+ Gold Certified, Military-Grade Components, Dual Ball Bearing, Axial-tech Fan, PCB Coating, 10 Year Warranty)
Military-grade components provide high reliability for power-hungry builds.
Efficiency80+ Gold
FormATX
CablesFull-Modular
Price$204.99
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$260.91
Amazon.com prices as of 03/23/2026 09:41 GMT+0000 —
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📊 Quick Comparison
See the key differences at a glance.
| # | Model | Wattage | Efficiency | Modular | Price |
|---|---|---|---|---|---|
| 1 | Corsair RM1200x Shift Fully Modular ATX Power Supply – Side Interface – ATX 3.1 & PCIe 5.1 Compliant – Zero RPM Fan Mode – 105u00b0C-Rated Capacitors – 80 Plus Gold Efficiency – Black | 1200W | 80+ Gold | Full-Modular | $194.99 |
| 2 | 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 | $129.90 |
| 3 | ASUS TUF Gaming 1200W Gold (1200 Watt, ATX 3.0 Compatible Fully Modular Power Supply, 80+ Gold Certified, Military-Grade Components, Dual Ball Bearing, Axial-tech Fan, PCB Coating, 10 Year Warranty) | 1200W | 80+ Gold | Full-Modular | $204.99 |
| ⬆️ | 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 XMP for optimal memory performance.
Use native 12V-2×6 cable for GPU.
🎯 What This Build Can Do
1440p Gaming
Enjoy smooth 1440p gaming experience at high settings in most modern games.
Content Creation
Handle video editing and streaming at 1080p with good performance.
Productivity
Great for multitasking with several applications open simultaneously.
🔧 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
Check case width for Corsair Shift side-mounted cable clearance.
🔗 Explore More Builds
See PSU recommendations for other CPU + GPU combinations.