Yeah, agreeing with the guys above, 1200W is definitely the floor for that combo. I've been doing this for twenty years and the 14900K is the first chip that actually made me nervous about my wall outlet lol. Honestly though, I've been a bit disappointed with the build quality on some of these newer units lately.

• MSI MEG Ai1300P PCIE5 1300W 80 Plus Platinum is what I ended up with after returning a few others. It handles the 4090 spikes like a champ and the software monitoring is actually useful for seeing how much juice the 14900K is chugging during renders. Sadly, it is pricey and the cables are still pretty stiff.
• Thermaltake Toughpower GF3 1200W 80+ Gold is the one to look for at Micro Center if you want to save some cash for extra storage. It works fine but feels a bit cheaper than the high-end stuff. I noticed the fan profile is a bit aggressive compared to the MSI.
• be quiet! Dark Power 13 1300W 80 Plus Titanium was a huge letdown for me. For that price, I expected dead silence but the fan had this pathetic little rattle that drove me nuts. Whatever you grab, dont skimp on the wattage. You dont want the PSU fan screaming at full tilt while you're trying to work. 1300W is probably the sweet spot where the fan wont even spin up half the time... just make sure you bend the cable carefully before plugging it in so there isnt any tension on the 4090 socket.

To add to the point above: I recently installed the Corsair RM1200x Shift 80 PLUS Gold ATX 3.0.

• Cybenetics noise rating is top-tier imo.
• Load regulation stays steady during 4K rendering.

Since the 14900K pulls 300W+ during rendering, I would suggest the Seasonic Vertex GX-1200 1200W Gold ATX 3.0. You really need that ATX 3.0 rating for the 2x total system power excursion tolerance. Be careful to seat the 12VHPWR cable fully till it clicks tho. 1000W works but 1200W keeps the fan curve lower and handles those transient spikes without tripping OCP.

Just saw this thread. I think sticking with a 1200W unit is probably the most sensible middle ground for that build. Not sure if 1500W is worth the extra cash unless you really want that extra peace of mind, but 1000W feels like it's cutting it too close when that i9 starts chugging power during a render. IIRC the transient spikes on the 4090 are what really kill the older units, so getting something with the native cable is a must. I've heard some brands have really stiff 12VHPWR cables that are a nightmare to bend in smaller cases, which is kinda scary given the melting issues people talked about. Tbh I'd just focus on finding something with a decent warranty and making sure that cable is seated perfectly. Safety first with those expensive parts... you definitely don't want a fire hazard in your office.

Quick reply while I have a sec... honestly it's getting ridiculous how much juice these parts need and it drives me crazy. I've been building for a long time too but this generation feels like a total scam with the prices and the power draw. It's like we're paying a premium just to worry about our connectors melting or the system tripping. I've tried a few of the big name brands recently and it feels like the quality control is just hitting the floor lately.

• Some brands have cables so stiff they're basically a workout to bend into a mid-tower.
• Other high-end units have such bad coil whine they'll drive you nuts while you're trying to focus on a render.
• The whole 12VHPWR situation is a total mess and I hate that we're basically beta testers for these new standards. I would suggest being really careful when you're stuffing everything into the case tho. I've had moments where I honestly thought I was gonna snap the header off the board just trying to get the side panel closed. It's frustrating that even when you spend 250 bucks, you still feel like you're taking a huge risk. Just sucks that this is the state of high-end pc building right now.

Saw this thread earlier and i am basically in the exact same position with my own build. It is honestly ridiculous how much time we have to spend worrying about whether a power supply is going to fail or melt a connector.

• The power requirements for this generation feel like a total scam when you consider the price of the hardware.
• Quality control across the board seems to be dipping even though we are paying more than ever for top tier units.
• It drives me crazy that we have to worry about transient spikes and specific cable bends just to use the parts we bought. I am still undecided myself because it feels like every option has some sort of deal breaking flaw lately. Companies really dont seem to care about the user experience as long as they can push these high wattage numbers.