So I just went through this whole mess building my first serious workstation, and honestly, I spent way too much time obsessing over the ultra-expensive boards. I thought I needed the absolute top-tier stuff for the i9-14900K cuz of the power draw, but I learned that some "Lite" or mid-range boards can actually handle the heat just as well if you look at the raw technical specs. Respectfully, I'd consider another option instead of the super pricey ones mentioned before. You want stability for a workstation, but you dont realy need to pay the $600 "gaming tax." Here is how I see it: 1. ASRock Z790 Taichi Lite: This thing is a beast for the price.
- Pros: It has a massive 24+1+2 phase VRM design—literally the same as their flagship—plus 5 M.2 slots and great DDR5 support. - Cons: The BIOS looks a bit old school and it has a very industrial look. 2. Gigabyte Z790 Aorus Elite AX V2: A solid value pick.
- Pros: Decent 16+1+2 power stages and 4 M.2 slots. It's very stable for standard workloads. - Cons: Heatsinks are smaller, so it might run a bit warmer than the ASRock under heavy rendering. I mean, the Taichi Lite is definately the way to go if you want flagship power delivery without the flagship price tag. It's saved me a ton of money that I put into extra storage. gl!

For your situation, honestly you gotta be careful because that chip is basically a space heater. I would suggest the ASUS ROG Maximus Z790 Dark Hero if you want zero headaches. It's got a massive 20+1+2 power stage setup that handles those crazy 14900K transient spikes like a champ. Basically, the VRM cooling is over-engineered with huge heatsinks so it wont throttle during long workstation renders or heavy tasks. Plus, it has five M.2 slots, so you're totally covered for storage things. I mean... I've seen people try to run this beast on mid-range boards and the VRMs literally hit 100C... definitely not ideal for stability. Just make sure ur case has decent airflow too! If that's too pricey, the Gigabyte Z790 Aorus Master X is also a total tank for power delivery. TL;DR: Grab the ASUS ROG Maximus Z790 Dark Hero for the best VRM stability and thermal overhead.

i9s run HOT, so beefy VRMs are mandatory. I would suggest MSI MAG Z790 Tomahawk WiFi DDR5 cuz its a solid $250 choice that handles ur power better than boards twice the price. Peace!