Hey, catching this a bit late but I had a similar headache when building my workstation last year. Honestly, when you are running dual 4090s and a Threadripper, those transient power spikes can trip a lower-tier PSU so easily. I learned the hard way that 1200W just doesnt leave enough headroom for comfort if you are pushing 24/7 renders. I ended up going with the Seasonic PRIME TX-1600 ATX 3.0 1600W Titanium and it has been rock solid. It comes with the native 12VHPWR cables which saves a ton of clutter and avoids the risk of melting adapters. If you can find it, the Corsair AX1600i 1600W Digital Titanium is also a beast because of its GaN transistors, though it is usually more expensive.

• Make sure you get an ATX 3.0/3.1 unit to handle GPU power spikes.
• The extra cost for Titanium efficiency pays for itself in heat reduction alone for 24/7 rigs.

Late to the party but honestly you dont always need to pay the titanium tax. Check the Cybenetics database or the Cultists Network tier list to save some cash. I usually recommend the Seasonic PRIME PX-1600 1600W 80 Plus Platinum if you find it on sale. Its basically bulletproof for rendering and way cheaper than those ultra-premium digital units while still being super reliable.

tbh thats a massive power draw. im not 100% sure which unit is technically the best for 24/7 rendering but I think I recall hearing that 1600W Titanium units are the only way to go. Not sure but I think some of the pros swear by specific server-grade platforms... you definitely want something with zero corners cut for that kind of heat tho, ngl.