Is 650W enough for an RTX 4070 Ti Super + Core i5-14600K?

Yes — 650 W handles this combination with room to spare.

noteSustained load: 534 W (Core i5-14600K 174 W measured peak + GeForce RTX 4070 Ti Super 285 W measured gaming + 75 W rest of system) = 82% of a 650 W unit.
goodSustained load is 82% of the unit's rating, and even the worst measured spike total (577 W) stays under 650 W.
noteSpike check: 174 W CPU + 328 W GPU spike + 75 W = 577 W momentary worst case — within the unit's rating.

The math, with sources

GPU sustained draw: 285 W — GeForce RTX 4070 Ti Super measured while gaming (TechPowerUp — GeForce RTX 5050 review, Power Consumption charts (July 2025 test suite)) — its rated board power is 285 W.
GPU transient spikes: 328 W — GeForce RTX 4070 Ti Super spikes to ~328 W for milliseconds (TechPowerUp — GeForce RTX 5050 review, Power Consumption charts (July 2025 test suite)). Spikes trip older PSUs that averages never show.
CPU peak draw: 174 W — Core i5-14600K measured under heavy all-core load (TechPowerUp — Core i9-14900K review, multi-threaded power chart (Blender, CPU-only)). Games draw less, but renders, encodes and shader compiles hit this.
Rest of the system: 75 W — Motherboard, RAM, drives, fans and USB devices — a fixed allowance.
Sustained total: 534 W — 174 + 285 + 75 = 534 W of steady load.
With 15% headroom: 614 W — Sustained x 1.15 — margin for capacitor aging, heat, and staying near the efficiency sweet spot. (The sustained figure is already conservative: CPU all-core peak and GPU gaming peak rarely coincide.)
Spike check: 577 W — CPU peak + GPU spike + rest = 577 W for milliseconds. The recommendation also covers this outright, so even a pre-ATX-3.0 unit is not spike-tripped.
Recommended: 650 W — The smallest standard size covering both 614 W (sustained + headroom) and 577 W (spike total).

AFFILIATE_SLOT: tested 650W ATX 3.x unit picks will be listed here. No links yet — added only once real recommendations exist.