Get the ASUS ROG Maximus Z790 Hero ATX LGA 1700. The VRM cooling is top tier for that chip. Just make sure your case airflow is solid, dont skimp on fans.

Man, I feel your pain. Dealing with thermal throttling on an i9 is a total nightmare when you have deadlines piling up. Honestly, if you want something rock solid that actually handles the power draw without breaking a sweat, look at the MSI MEG Z790 ACE E-ATX LGA 1700. It is a beast. The VRM heatsink design is legit massive and keeps everything cool even under heavy rendering loads. I have been running it for months and honestly have zero complaints, it just works perfectly. Another solid option if you want to save a few bucks for more RAM is the Gigabyte Z790 AORUS Master LGA 1700 DDR5. It has phenomenal power delivery and the BIOS is pretty intuitive once you get used to it. I have pushed my chip hard and it stays stable as a rock. Just make sure you check your case clearance since those boards are chonky. Seriously, stop messing around with that old board and swap it out. You will be so much happier once you can actually finish a project without the whole system locking up on you. Good luck with the build, you will get back to work in no time.