Since you're buying an Intel CPU, faster RAM will increase performance in Premiere Pro. I suggest buying 6000MT/s RAM that's on the mobo QVL list, or recommended by other forum members. I use 2 x 32GB 4800MT/s RAM in my AMD 7950X rig, because faster RAM does not really benefit video processing significantly on AMD systems (and it was much cheaper in December 2022).
https://www.pugetsystems.com/labs/a...023-update/#Video_Editing_and_Motion_Graphics
I strongly recommend fitting a really big CPU heatsink in your video editing rig. I'm using a Noctua NH-D15, but you could use a Dark Rock Pro 4 or similar. Even better would be a 240 or 360mm AIO water cooler. You can get excellent dual-tower twin-fan air coolers for around $50. Water coolers are more expensive.
Bear in mind the maximum power dissipation of the i7-12700K when frequency boost is active is 190 Watts. This is significantly higher than the nominal rating of 125W. You should consider a heatsink capable of dissipating 200W continuously. This will help reduce CPU throttling at 100C, but the number of inexpensive coolers capable of dissipating 200W is quite small.
During video rendering runs, typical CPU usage will be 70 to 100%. GPU usage will normally be pinned at 100% with OpenGL operations. I use MSI Afterburner to reduce my GTX 3060's max power level to 95%, which increases stability in Topaz Video AI. At 95%, GPU dissipation drops from 170W to roughly 160W.
The stock i7-12700K heatsink may cause the CPU to throttle at 100C during sustained high power rendering runs. On my 7950X system, processing a 1 hour video takes 9 to 11 hours. A 1080p to 4K Topaz conversion of a 1 hour video, with 'Rolling Shutter Correction' and 'Reduce Jittery Motions' enabled, took 36 hours. My CPU ran at 140W and the GPU at 165W continuously all this time.
On a final note, if your mobo has a second M.2 NVMe slot, consider fitting a cheap 500GB SSD, for use as a Premiere Pro scratch disk. N.B. I have 3 1TB NVMe SSDs and 5 hard disks (30TB) in my rig. You can never get enough storage when working with video.
TLDR. Your video rig will get hot. Fit decent cooling to the case and the CPU.