yo, so i actually just finished a similar build and honestly, you gotta go with 1000W. i tried running an 850W with my 14900K and it technically worked, but that chip spikes like crazy and the fan noise was super annoying cuz it was basically maxing out under load. here's my quick tip for you:

1. definitely grab the Corsair RM1000e (2023) Fully Modular Low-Noise ATX 3.0 because it's native ATX 3.0 and the 12VHPWR cable is way cleaner than using adapters. plus it's seriously quiet.
2. if you want something highkey top tier, the Seasonic VERTEX GX-1000 1000W 80+ Gold is literally a tank and has a 12-year warranty.

i mean, 850W is probably fine for just gaming, but 1000W gives you that overhead so the PSU stays in the efficiency sweet spot and runs silent... well, mostly silent lol. gl with the build!

Seconding the recommendation above. Honestly, I tried cutting corners with a cheaper 850W on my old rig and unfortunately it basically fried my motherboard when the GPU spiked... not fun. Idk if it was just bad luck or what, but for a 14900K and 4080, you highkey need that 1000W headroom just for peace of mind. Safety first, right? Plus, it'll run way quieter when it’s not pushed to the limit. gl!

For your situation, honestly go with 1000W. The i9-14900K is a power hog and can spike way past its TDP, so having that extra headroom is basically mandatory if you want it quiet. I'd grab the Corsair RM1000e (2023) Fully Modular Low-Noise ATX 3.0 or the Seasonic VERTEX GX-1000 1000W 80+ Gold. Both are super reliable and come with the native 12VHPWR cable you're looking for. peace

🙌

So I actually just went through this exact same thing when I was deciding whether to pay a shop to build my rig or just do the DIY thing myself

• I ended up doing it myself because I wanted to make sure every single cable was clicked in perfectly especially with that new 12VHPWR connector
• I spent so much time looking at technical teardowns even though I am still kind of a beginner with the electrical side of things
• I was really worried about how the i9-14900K behaves during heavy tasks so I looked for units with really high quality capacitors - honestly doing it yourself is SO much better because you can choose the specific parts that fit your noise goals - here are some options I found that are super solid for this kind of build:
• be quiet! Dark Power 13 1000W - this is a Titanium rated unit and since it has a frameless fan it stays basically SILENT even when you are pushing the CPU and 4080
• MSI MPG A1000G PCIE5 1000W - it is a bit more budget friendly but still has the native ATX 3.0 support and the technical reviews show it handles spikes really well
• FSP Hydro Ti Pro 1000W
• I read that this is one of the best for efficiency and it is actually really compact which makes the DIY cable management way easier I really think 1000W is the way to go just so the PSU isnt working as hard which keeps the heat down - do you think getting a Titanium unit is overkill or does the efficiency actually help with the room temperature?