What PSU Do You Need for the NVIDIA GeForce RTX 3070?
Recommended wattage, the realistic minimum, and the connector you need — with a live peak-draw estimate.
Card peak (TBP)
220W
Recommended PSU
650W
Practical baseline
600W
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Estimate your full-system peak draw
Quick Summary · TL;DR
For the NVIDIA GeForce RTX 3070, get a 650W 80+ Gold power supply (600W minimum). The card peaks near 220W; the rest of the recommendation is headroom for your CPU and the transient spikes modern GPUs produce.
Why 650W and not less?
The NVIDIA GeForce RTX 3070 has a board power of about 220W, but it can spike well above that for milliseconds at a time. Add a typical gaming CPU and the rest of the system, then keep the supply in its efficient 50-80% load band, and 650W is the comfortable target. The NVIDIA GeForce RTX 3070 draws power through a 8-pin PCIe connector, so any quality unit with the right PCIe cables works; an ATX 3.x unit is still a nice-to-have for transient headroom.
Three power supplies that fit the NVIDIA GeForce RTX 3070
Load figures assume this card at its 220W peak alongside a Ryzen 7 or Core i7 class CPU and 75W for the rest of the system, so roughly 435W at the wall-facing side of the supply. The card draws through an 8-pin PCIe connector.
Balanced
Corsair CX650 (2023) 650W 80+ Bronze
650W · 80+ Bronze
The small step up from the CX550 for a build that will take a hotter CPU. Same 140 mm body, same non-modular caveat.
Check the CX650 on AmazonRoom to upgrade
Best fitCorsair RM750e (2025) 750W 80+ Gold ATX 3.1
750W · 80+ Gold
The 140 mm body clears nearly any case and the 600W 12V-2x6 cable covers a current-gen NVIDIA upgrade. One native 6+2 plus two more off the GPU cable.
Check the RM750e on AmazonAnything under 60% keeps a hybrid-mode fan off for most of a gaming session, which is why the RM750e is the pick here rather than the cheapest unit that technically fits. Specifications are taken from each manufacturer's product page; confirm the exact revision before ordering, as connector counts change between refreshes of the same model name. As an Amazon Associate, SpecsCalc earns from qualifying purchases.
Sources & verification
The 550W baseline is the manufacturer-class figure for the NVIDIA GeForce RTX 3070; the 650W target adds room for CPU choice and transient load. How both numbers are derived is set out in the methodology.
Frequently asked questions
What power supply do I need for the NVIDIA GeForce RTX 3070?
A 650W 80+ Gold unit is the recommended choice; it covers the card’s peak draw plus a transient-safe buffer and keeps the PSU in its efficient load band. 600W is the realistic minimum for a single-GPU build.
Is a 600W PSU enough for the NVIDIA GeForce RTX 3070?
It can run a modest build, since the card itself peaks around 220W, but it leaves little headroom for a power-hungry CPU or transient spikes. Stepping up to 650W is the safer, quieter long-term choice.
Does the NVIDIA GeForce RTX 3070 need an ATX 3.0 power supply?
No — it uses standard 8-pin PCIe power, so any quality PSU with the correct PCIe cables is fine. An ATX 3.x unit simply adds extra transient headroom.
Different parts? Run the full PSU Wattage Calculator, or browse every GPU’s PSU requirement.