oh man, i totally get it. i remember my first big 4K job on my old rig... the preview window was literally like a powerpoint presentation once i added a second node in Blackmagic Design DaVinci Resolve 18.6. it was a nightmare lol.

for your situation, i would suggest the AMD Ryzen 9 7950X 16-Core 32-Thread Desktop Processor. honestly, i've seen people jump to Threadripper because they think they need the 'pro' label, but the 7950X is actually better for most 4K workflows i think. Premiere and Resolve really love that high clock speed for the UI and playback. i mean, the AMD Ryzen Threadripper 7960X 24-Core 48-Thread Processor is a monster, but the motherboard alone is gonna cost u like double what the Ryzen one does... plus u gotta buy way more expensive RAM. that price jump is just huge!!

basically, the 7950X gives u 16 cores which is plenty for 4K 10-bit in my experience. i use it and it handles multi-cam like a champ, but i guess if u were doing heavy VFX all day then maybe look at the Threadripper? for what ur describing tho, stick with the Ryzen 9.

the big lesson i learned is that for standard 4K, the platform cost of Threadripper just isnt worth it for most of us. use the saved cash to grab like 64GB of G.SKILL Trident Z5 Neo RGB 64GB DDR5-6000 and maybe a beefy GPU instead. i'm still learning some of the deep technical stuff, but for real-world editing? this setup has been great for me. what kind of GPU are u planning to pair it with?? anyway, gl with the build!!

Basically, for 4K 10-bit work, the AMD Ryzen 9 7950X is definitely the sweet spot because you get high clock speeds that keep the timeline snappy, which is honestly more important than raw core count once you're past 16 cores anyway. While a AMD Ryzen Threadripper 7960X is definitely a beast as mentioned, it's mostly for people doing heavy 8K RED footage or needing massive PCIe lanes, so unless you're that guy, just grab the 7950X and put the extra money into a NVIDIA GeForce RTX 4090 24GB since Resolve is super GPU-dependent for color grading. Honestly, the workstation jump is a massive price hike for diminishing returns on a standard 4K workflow, and the AM5 platform gives you way better value for the money right now... just my two cents tho!

Honestly, I've been doing this for a long time but I'm still learning the tech side of things everyday. I spent WEEKS researching the market before my last build. Basically, I was always an Intel user because of their QuickSync stuff which helps with 10-bit h.264/h.265 footage, so I was really nervous about switching to AMD. I looked at the Intel Core i9-14900K Desktop CPU vs the AMD options, and the market research shows that while Intel has that specific video decoding edge, the AMD chips just feel more stable for long-term workstation use. I ended up looking into the AMD Ryzen 9 7950X3D 16-Core Gaming Processor too, thinking the extra cache might help, but for editing, the regular 7950X is usually better in the benchmarks I saw. Does anyone know if the 10-bit playback is smoother on Intel though? I keep hearing mixed things about codecs. Anyway, if ur staying AMD, the 7950X seems to be the market leader for a reason right now. Its just a better value than the high-end stuff.

honestly been thinking about your build all day because i'm in the same boat!!! i totally agree that the 7950X is the sweet spot compared to those super expensive workstation chips. but since you're doing a DIY build, have you looked at the newest version?? the AMD Ryzen 9 9950X is out now and it looks like a beast for rendering. i'm literally so excited to try building one myself but also super nervous lol. if you go the DIY route like i'm planning, don't forget:
* a really big cooler like the ARCTIC Liquid Freezer III 420 because these things get crazy hot
* a motherboard like the ASUS ProArt X670E-Creator WiFi which has 10G LAN for editing off a NAS
* plenty of fast storage!! do you think the 9950X is worth the extra cost over the 7950X? i'm still trying to figure out if the performance jump is big enough for 4K workflows... but building it yourself is definitely the way to go to save cash!!

Finally someone says it. Ive been thinking this for a while but wasnt sure.

honestly i'd just get the AMD Ryzen 9 7900X 12-Core Processor! it's like $380 and totally amazing for 4K. skip the super pricey ones and save ur money for more SSDs or stuff lol

Great info, saved!