Power Supply Buying Guide
Everything you need to pick the right PSU — wattage sizing, efficiency ratings, and ATX 3.1 compatibility for modern GPUs. Updated with current pricing
QUICK PICKS
Best PSU for...
BEST BUDGET
Deepcool PK650D $70
650W | 80+ Gold | Semi-modular
BEST VALUE
MSI MAG A850GL PCIE5 $107
850W | 80+ Gold, ATX 3.1 | Fully modular
BEST HIGH-END
Corsair RM1000x SHIFT $180
1000W | 80+ Gold, ATX 3.1 | Side-cable design
THE BASICS
What actually matters when buying a PSU
WATTAGE
How much you need
750W covers most RTX 5070 builds. 850W is the 2026 sweet spot for RTX 5080. RTX 5090 wants 1000W+.
ATX 3.1 / PCIe 5.1
Why it's non-negotiable now
Modern GPUs draw fast transient power spikes — ATX 3.1 units handle these without tripping shutdown protection.
EFFICIENCY RATING
80+ Gold is the sweet spot
Gold balances price and efficiency well. Platinum/Titanium mainly matter for servers or extreme thermal builds.
MODULARITY
Why it's worth paying forFully modular units let you skip unused cables entirely — cleaner airflow and easier builds, especially in small cases.
FULL COMPARISON
PSU Comparison Table
PSU | Price | Wattage | Ratings | Best for |
Deepcool PK650D | $70 | 650W | 80+ Gold | Budget mid-range GPU |
MSI MAG A750GL PCIE5 | $90 | 750W | 80+ Gold | RTX 5070 builds |
MSI MAG A850GL PCIE5 — Best Value | $107 | 850W | 80+ Gold | 1440p sweet spot |
Corsair RM850x ATX 3.1 | $140 | 850W | 80+ Gold | RTX 5080 headroom |
Corsair RM1000x SHIFT | $180 | 1000W | 80+ Gold | RTX 5080 / 5090 |
Corsair RM1200x ATX 3.1 | $230 | 1200W | 80+ Gold | RTX 5090 / dual-GPU |